af_iucv: New error return codes for connect()

If the iucv_path_connect() call fails then return an error code that
corresponds to the iucv_path_connect() failure condition; instead of
returning -ECONNREFUSED for any failure.

This helps to improve error handling for user space applications
(e.g.  inform the user that the z/VM guest is not authorized to
connect to other guest virtual machines).

The error return codes are based on those described in connect(2).

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 1 deletions

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index af3192d2a5a..1077bc4e6e2 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -494,7 +494,21 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
         if (err) {
                 iucv_path_free(iucv->path);
                 iucv->path = NULL;
-                err = -ECONNREFUSED;
+                switch (err) {
+                case 0x0b:      /* Target communicator is not logged on */
+                        err = -ENETUNREACH;
+                        break;
+                case 0x0d:      /* Max connections for this guest exceeded */
+                case 0x0e:      /* Max connections for target guest exceeded */
+                        err = -EAGAIN;
+                        break;
+                case 0x0f:      /* Missing IUCV authorization */
+                        err = -EACCES;
+                        break;
+                default:
+                        err = -ECONNREFUSED;
+                        break;
+                }
                 goto done;
         }