[CIFS] implement upcalls for SPNEGO blob via keyctl API

Add routines to handle upcalls to userspace via keyctl for the purpose
of getting a SPNEGO blob for a particular uid and server combination.

Clean up the Makefile a bit and set it up to only compile cifs_spnego
if CONFIG_CIFS_UPCALL is set. Also change CONFIG_CIFS_UPCALL to depend
on CONFIG_KEYS rather than CONFIG_CONNECTOR.

cifs_spnego.h defines the communications between kernel and userspace
and is intended to be shared with userspace programs.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 1ffe25592b2..dd1d7c200ee 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -76,6 +76,8 @@ extern void header_assemble(struct smb_hdr *, char /* command */ ,
 extern int small_smb_init_no_tc(const int smb_cmd, const int wct,
                                 struct cifsSesInfo *ses,
                                 void **request_buf);
+extern struct key *cifs_get_spnego_key(struct cifsSesInfo *sesInfo,
+                                        const char *hostname);
 extern int CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
                              const int stage,
                              const struct nls_table *nls_cp);