smb3: send CAP_DFS capability during session setup

We had a report of a server which did not do a DFS referral
because the session setup Capabilities field was set to 0
(unlike negotiate protocol where we set CAP_DFS).  Better to
send it session setup in the capabilities as well (this also
more closely matches Windows client behavior).

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 33efc5fb293c..31e4a1b0b170 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1196,7 +1196,12 @@ SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
         else
                 req->SecurityMode = 0;
 
+#ifdef CONFIG_CIFS_DFS_UPCALL
+        req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
+#else
         req->Capabilities = 0;
+#endif /* DFS_UPCALL */
+
         req->Channel = 0; /* MBZ */
 
         sess_data->iov[0].iov_base = (char *)req;