net/ipv6: Make __inet6_bind static

BPF core gets access to __inet6_bind via ipv6_bpf_stub_impl, so it is
not invoked directly outside of af_inet6.c. Make it static and move
inet6_bind after to avoid forward declaration.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ipv6.h

@@ -1044,8 +1044,6 @@ void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
 
 int inet6_release(struct socket *sock);
-int __inet6_bind(struct sock *sock, struct sockaddr *uaddr, int addr_len,
-		 bool force_bind_address_no_port, bool with_lock);
 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 		  int peer);

net/ipv6/af_inet6.c

@@ -273,32 +273,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
 	goto out;
 }
 
-
-/* bind for INET6 API */
-int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
-{
-	struct sock *sk = sock->sk;
-	int err = 0;
-
-	/* If the socket has its own bind function then use it. */
-	if (sk->sk_prot->bind)
-		return sk->sk_prot->bind(sk, uaddr, addr_len);
-
-	if (addr_len < SIN6_LEN_RFC2133)
-		return -EINVAL;
-
-	/* BPF prog is run before any checks are done so that if the prog
-	 * changes context in a wrong way it will be caught.
-	 */
-	err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
-	if (err)
-		return err;
-
-	return __inet6_bind(sk, uaddr, addr_len, false, true);
-}
-EXPORT_SYMBOL(inet6_bind);
-
-int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
+static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 			bool force_bind_address_no_port, bool with_lock)
 {
 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
@@ -444,6 +419,30 @@ int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 	goto out;
 }
 
+/* bind for INET6 API */
+int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	/* If the socket has its own bind function then use it. */
+	if (sk->sk_prot->bind)
+		return sk->sk_prot->bind(sk, uaddr, addr_len);
+
+	if (addr_len < SIN6_LEN_RFC2133)
+		return -EINVAL;
+
+	/* BPF prog is run before any checks are done so that if the prog
+	 * changes context in a wrong way it will be caught.
+	 */
+	err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
+	if (err)
+		return err;
+
+	return __inet6_bind(sk, uaddr, addr_len, false, true);
+}
+EXPORT_SYMBOL(inet6_bind);
+
 int inet6_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;