net: Return errno in sk->sk_prot->get_port().

We assume the correct errno is -EADDRINUSE when sk->sk_prot->get_port()
fails, so some ->get_port() functions return just 1 on failure and the
callers return -EADDRINUSE instead.

However, mptcp_get_port() can return -EINVAL.  Let's not ignore the error.

Note the only exception is inet_autobind(), all of whose callers return
-EAGAIN instead.

Fixes: cec37a6e ("mptcp: Handle MP_CAPABLE options for outgoing connections")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/af_inet.c

@@ -522,9 +522,9 @@ int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 	/* Make sure we are allowed to bind here. */
 	if (snum || !(inet->bind_address_no_port ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
-		if (sk->sk_prot->get_port(sk, snum)) {
+		err = sk->sk_prot->get_port(sk, snum);
+		if (err) {
 			inet->inet_saddr = inet->inet_rcv_saddr = 0;
-			err = -EADDRINUSE;
 			goto out_release_sock;
 		}
 		if (!(flags & BIND_FROM_BPF)) {

net/ipv4/inet_connection_sock.c

@@ -471,11 +471,11 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 	bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
 	bool found_port = false, check_bind_conflict = true;
 	bool bhash_created = false, bhash2_created = false;
+	int ret = -EADDRINUSE, port = snum, l3mdev;
 	struct inet_bind_hashbucket *head, *head2;
 	struct inet_bind2_bucket *tb2 = NULL;
 	struct inet_bind_bucket *tb = NULL;
 	bool head2_lock_acquired = false;
-	int ret = 1, port = snum, l3mdev;
 	struct net *net = sock_net(sk);
 
 	l3mdev = inet_sk_bound_l3mdev(sk);
@@ -1186,7 +1186,7 @@ int inet_csk_listen_start(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct inet_sock *inet = inet_sk(sk);
-	int err = -EADDRINUSE;
+	int err;
 
 	reqsk_queue_alloc(&icsk->icsk_accept_queue);
 
@@ -1202,7 +1202,8 @@ int inet_csk_listen_start(struct sock *sk)
 	 * after validation is complete.
 	 */
 	inet_sk_state_store(sk, TCP_LISTEN);
-	if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
+	err = sk->sk_prot->get_port(sk, inet->inet_num);
+	if (!err) {
 		inet->inet_sport = htons(inet->inet_num);
 
 		sk_dst_reset(sk);

net/ipv4/ping.c

@@ -138,7 +138,7 @@ int ping_get_port(struct sock *sk, unsigned short ident)
 
 fail:
 	spin_unlock(&ping_table.lock);
-	return 1;
+	return -EADDRINUSE;
 }
 EXPORT_SYMBOL_GPL(ping_get_port);
 

net/ipv4/udp.c

@@ -240,7 +240,7 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
 	struct udp_table *udptable = udp_get_table_prot(sk);
 	struct udp_hslot *hslot, *hslot2;
 	struct net *net = sock_net(sk);
-	int error = 1;
+	int error = -EADDRINUSE;
 
 	if (!snum) {
 		DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);

net/ipv6/af_inet6.c

@@ -410,10 +410,10 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 	/* Make sure we are allowed to bind here. */
 	if (snum || !(inet->bind_address_no_port ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
-		if (sk->sk_prot->get_port(sk, snum)) {
+		err = sk->sk_prot->get_port(sk, snum);
+		if (err) {
 			sk->sk_ipv6only = saved_ipv6only;
 			inet_reset_saddr(sk);
-			err = -EADDRINUSE;
 			goto out;
 		}
 		if (!(flags & BIND_FROM_BPF)) {