[CIFS] Allow raw ntlmssp code to be enabled with sec=ntlmssp

On mount, "sec=ntlmssp" can now be specified to allow
"rawntlmssp" security to be enabled during
CIFS session establishment/authentication (ntlmssp used to
require specifying krb5 which was counterintuitive).

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 3a934dd..4aa81a5 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -979,6 +979,13 @@
 				return 1;
 			} else if (strnicmp(value, "krb5", 4) == 0) {
 				vol->secFlg |= CIFSSEC_MAY_KRB5;
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+			} else if (strnicmp(value, "ntlmsspi", 8) == 0) {
+				vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
+					CIFSSEC_MUST_SIGN;
+			} else if (strnicmp(value, "ntlmssp", 7) == 0) {
+				vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
+#endif
 			} else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 				vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 					CIFSSEC_MUST_SIGN;