[PATCH v2 net-next 3/4] net: Unexport shared functions for DCCP.

[Kuniyuki Iwashima <kuniyu@amazon.com>]

DCCP was removed, so many inet functions no longer need to
be exported.

Let's unexport or use EXPORT_IPV6_MOD() for such functions.

sk_free_unlock_clone() is inlined in sk_clone_lock() as it's
the only caller.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
v2: Leave inet_twsk_put as is for nf_tproxy
---
 include/net/sock.h               |  1 -
 net/core/sock.c                  | 24 ++++++++----------------
 net/ipv4/inet_connection_sock.c  | 12 +-----------
 net/ipv4/inet_hashtables.c       | 16 +++++-----------
 net/ipv4/inet_timewait_sock.c    |  4 ----
 net/ipv6/af_inet6.c              |  1 -
 net/ipv6/inet6_connection_sock.c |  2 --
 7 files changed, 14 insertions(+), 46 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 8daf1b3b12c6..0d13d021ef5e 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1745,7 +1745,6 @@ void sk_free(struct sock *sk);
 void sk_net_refcnt_upgrade(struct sock *sk);
 void sk_destruct(struct sock *sk);
 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority);
-void sk_free_unlock_clone(struct sock *sk);
 
 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
 			     gfp_t priority);
diff --git a/net/core/sock.c b/net/core/sock.c
index 323892066def..e76b2bcec33d 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2489,17 +2489,14 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 		 */
 		if (!is_charged)
 			RCU_INIT_POINTER(newsk->sk_filter, NULL);
-		sk_free_unlock_clone(newsk);
-		newsk = NULL;
+
 		goto out;
 	}
+
 	RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
 
-	if (bpf_sk_storage_clone(sk, newsk)) {
-		sk_free_unlock_clone(newsk);
-		newsk = NULL;
+	if (bpf_sk_storage_clone(sk, newsk))
 		goto out;
-	}
 
 	/* Clear sk_user_data if parent had the pointer tagged
 	 * as not suitable for copying when cloning.
@@ -2528,19 +2525,14 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 	if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
 		net_enable_timestamp();
 out:
-	return newsk;
-}
-EXPORT_SYMBOL_GPL(sk_clone_lock);
-
-void sk_free_unlock_clone(struct sock *sk)
-{
 	/* It is still raw copy of parent, so invalidate
 	 * destructor and make plain sk_free() */
-	sk->sk_destruct = NULL;
-	bh_unlock_sock(sk);
-	sk_free(sk);
+	newsk->sk_destruct = NULL;
+	bh_unlock_sock(newsk);
+	sk_free(newsk);
+	return NULL;
 }
-EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
+EXPORT_SYMBOL_GPL(sk_clone_lock);
 
 static u32 sk_dst_gso_max_size(struct sock *sk, struct dst_entry *dst)
 {
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 9a20b84dc022..a195203e7eef 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -767,7 +767,6 @@ void inet_csk_init_xmit_timers(struct sock *sk,
 	timer_setup(&sk->sk_timer, keepalive_handler, 0);
 	icsk->icsk_pending = icsk->icsk_ack.pending = 0;
 }
-EXPORT_SYMBOL(inet_csk_init_xmit_timers);
 
 void inet_csk_clear_xmit_timers(struct sock *sk)
 {
@@ -780,7 +779,6 @@ void inet_csk_clear_xmit_timers(struct sock *sk)
 	sk_stop_timer(sk, &icsk->icsk_delack_timer);
 	sk_stop_timer(sk, &sk->sk_timer);
 }
-EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
 
 void inet_csk_clear_xmit_timers_sync(struct sock *sk)
 {
@@ -831,7 +829,6 @@ struct dst_entry *inet_csk_route_req(const struct sock *sk,
 	__IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(inet_csk_route_req);
 
 struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
 					    struct sock *newsk,
@@ -898,7 +895,6 @@ int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
 		req->num_retrans++;
 	return err;
 }
-EXPORT_SYMBOL(inet_rtx_syn_ack);
 
 static struct request_sock *
 reqsk_alloc_noprof(const struct request_sock_ops *ops, struct sock *sk_listener,
@@ -1058,14 +1054,13 @@ bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req)
 {
 	return __inet_csk_reqsk_queue_drop(sk, req, false);
 }
-EXPORT_SYMBOL(inet_csk_reqsk_queue_drop);
 
 void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req)
 {
 	inet_csk_reqsk_queue_drop(sk, req);
 	reqsk_put(req);
 }
-EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put);
+EXPORT_IPV6_MOD(inet_csk_reqsk_queue_drop_and_put);
 
 static void reqsk_timer_handler(struct timer_list *t)
 {
@@ -1209,7 +1204,6 @@ bool inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
 	inet_csk_reqsk_queue_added(sk);
 	return true;
 }
-EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
 
 static void inet_clone_ulp(const struct request_sock *req, struct sock *newsk,
 			   const gfp_t priority)
@@ -1290,7 +1284,6 @@ struct sock *inet_csk_clone_lock(const struct sock *sk,
 
 	return newsk;
 }
-EXPORT_SYMBOL_GPL(inet_csk_clone_lock);
 
 /*
  * At this point, there should be no process reference to this
@@ -1380,7 +1373,6 @@ int inet_csk_listen_start(struct sock *sk)
 	inet_sk_set_state(sk, TCP_CLOSE);
 	return err;
 }
-EXPORT_SYMBOL_GPL(inet_csk_listen_start);
 
 static void inet_child_forget(struct sock *sk, struct request_sock *req,
 			      struct sock *child)
@@ -1475,7 +1467,6 @@ struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
 	sock_put(child);
 	return NULL;
 }
-EXPORT_SYMBOL(inet_csk_complete_hashdance);
 
 /*
  *	This routine closes sockets which have been at least partially
@@ -1590,4 +1581,3 @@ struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu)
 out:
 	return dst;
 }
-EXPORT_SYMBOL_GPL(inet_csk_update_pmtu);
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 5bf163f756e9..d1960701a3b4 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -713,7 +713,7 @@ bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 	}
 	return ok;
 }
-EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
+EXPORT_IPV6_MOD(inet_ehash_nolisten);
 
 static int inet_reuseport_add_sock(struct sock *sk,
 				   struct inet_listen_hashbucket *ilb)
@@ -771,7 +771,7 @@ int __inet_hash(struct sock *sk, struct sock *osk)
 
 	return err;
 }
-EXPORT_SYMBOL(__inet_hash);
+EXPORT_IPV6_MOD(__inet_hash);
 
 int inet_hash(struct sock *sk)
 {
@@ -782,7 +782,6 @@ int inet_hash(struct sock *sk)
 
 	return err;
 }
-EXPORT_SYMBOL_GPL(inet_hash);
 
 void inet_unhash(struct sock *sk)
 {
@@ -823,7 +822,7 @@ void inet_unhash(struct sock *sk)
 		spin_unlock_bh(lock);
 	}
 }
-EXPORT_SYMBOL_GPL(inet_unhash);
+EXPORT_IPV6_MOD(inet_unhash);
 
 static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
 				    const struct net *net, unsigned short port,
@@ -982,14 +981,14 @@ int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
 {
 	return __inet_bhash2_update_saddr(sk, saddr, family, false);
 }
-EXPORT_SYMBOL_GPL(inet_bhash2_update_saddr);
+EXPORT_IPV6_MOD(inet_bhash2_update_saddr);
 
 void inet_bhash2_reset_saddr(struct sock *sk)
 {
 	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
 		__inet_bhash2_update_saddr(sk, NULL, 0, true);
 }
-EXPORT_SYMBOL_GPL(inet_bhash2_reset_saddr);
+EXPORT_IPV6_MOD(inet_bhash2_reset_saddr);
 
 /* RFC 6056 3.3.4.  Algorithm 4: Double-Hash Port Selection Algorithm
  * Note that we use 32bit integers (vs RFC 'short integers')
@@ -1214,7 +1213,6 @@ int inet_hash_connect(struct inet_timewait_death_row *death_row,
 	return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
 				   __inet_check_established);
 }
-EXPORT_SYMBOL_GPL(inet_hash_connect);
 
 static void init_hashinfo_lhash2(struct inet_hashinfo *h)
 {
@@ -1265,7 +1263,6 @@ int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
 	init_hashinfo_lhash2(h);
 	return 0;
 }
-EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
 
 int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 {
@@ -1305,7 +1302,6 @@ int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 	hashinfo->ehash_locks_mask = nblocks - 1;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
 
 struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
 						 unsigned int ehash_entries)
@@ -1341,7 +1337,6 @@ struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
 err:
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_alloc);
 
 void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
 {
@@ -1352,4 +1347,3 @@ void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
 	vfree(hashinfo->ehash);
 	kfree(hashinfo);
 }
-EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_free);
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index aded4bf1bc16..67efe9501581 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -166,7 +166,6 @@ void inet_twsk_hashdance_schedule(struct inet_timewait_sock *tw,
 	spin_unlock(lock);
 	local_bh_enable();
 }
-EXPORT_SYMBOL_GPL(inet_twsk_hashdance_schedule);
 
 static void tw_timer_handler(struct timer_list *t)
 {
@@ -223,7 +222,6 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
 
 	return tw;
 }
-EXPORT_SYMBOL_GPL(inet_twsk_alloc);
 
 /* These are always called from BH context.  See callers in
  * tcp_input.c to verify this.
@@ -306,7 +304,6 @@ void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm)
 		mod_timer_pending(&tw->tw_timer, jiffies + timeo);
 	}
 }
-EXPORT_SYMBOL_GPL(__inet_twsk_schedule);
 
 /* Remove all non full sockets (TIME_WAIT and NEW_SYN_RECV) for dead netns */
 void inet_twsk_purge(struct inet_hashinfo *hashinfo)
@@ -365,4 +362,3 @@ void inet_twsk_purge(struct inet_hashinfo *hashinfo)
 		rcu_read_unlock();
 	}
 }
-EXPORT_SYMBOL_GPL(inet_twsk_purge);
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index f60ec8b0f8ea..85bf681d427b 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -881,7 +881,6 @@ bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 	}
 	return false;
 }
-EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 
 static struct packet_type ipv6_packet_type __read_mostly = {
 	.type = cpu_to_be16(ETH_P_IPV6),
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index dbcf556a35bb..8f500eaf33cf 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -54,7 +54,6 @@ struct dst_entry *inet6_csk_route_req(const struct sock *sk,
 
 	return dst;
 }
-EXPORT_SYMBOL(inet6_csk_route_req);
 
 static inline
 struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
@@ -137,4 +136,3 @@ struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
 	dst = inet6_csk_route_socket(sk, &fl6);
 	return IS_ERR(dst) ? NULL : dst;
 }
-EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
-- 
2.49.0