Do not send SMB2 signatures for SMB3 frames

Restructure code to make SMB2 vs. SMB3 signing a protocol
specific op.  SMB3 signing (AES_CMAC) is not enabled yet,
but this restructuring at least makes sure we don't send
an smb2 signature on an smb3 signed connection. A followon
patch will add AES_CMAC and enable smb3 signing.

Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Jeff Layton <jlayton@samba.org>

5 files changed, 86 insertions, 5 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 74a07b604ffd..dfab450a191e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -367,6 +367,8 @@ struct smb_version_operations {
         void (*set_lease_key)(struct inode *, struct cifs_fid *fid);
         /* generate new lease key */
         void (*new_lease_key)(struct cifs_fid *fid);
+        int (*calc_signature)(struct smb_rqst *rqst,
+                                   struct TCP_Server_Info *server);
 };
 
 struct smb_version_values {
@@ -1489,6 +1491,6 @@ extern struct smb_version_values smb20_values;
 extern struct smb_version_operations smb21_operations;
 extern struct smb_version_values smb21_values;
 #define SMB30_VERSION_STRING    "3.0"
-/*extern struct smb_version_operations smb30_operations; */ /* not needed yet */
+extern struct smb_version_operations smb30_operations;
 extern struct smb_version_values smb30_values;
 #endif  /* _CIFS_GLOB_H */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 290c13442f75..f3276239e075 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1085,7 +1085,7 @@ cifs_parse_smb_version(char *value, struct smb_vol *vol)
                 vol->vals = &smb21_values;
                 break;
         case Smb_30:
-                vol->ops = &smb21_operations; /* currently identical with 2.1 */
+                vol->ops = &smb30_operations;
                 vol->vals = &smb30_values;
                 break;
 #endif
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index ad4d96a4bff5..d79de7bc4435 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -623,6 +623,74 @@ struct smb_version_operations smb21_operations = {
         .get_lease_key = smb2_get_lease_key,
         .set_lease_key = smb2_set_lease_key,
         .new_lease_key = smb2_new_lease_key,
+        .calc_signature = smb2_calc_signature,
+};
+
+
+struct smb_version_operations smb30_operations = {
+        .compare_fids = smb2_compare_fids,
+        .setup_request = smb2_setup_request,
+        .setup_async_request = smb2_setup_async_request,
+        .check_receive = smb2_check_receive,
+        .add_credits = smb2_add_credits,
+        .set_credits = smb2_set_credits,
+        .get_credits_field = smb2_get_credits_field,
+        .get_credits = smb2_get_credits,
+        .get_next_mid = smb2_get_next_mid,
+        .read_data_offset = smb2_read_data_offset,
+        .read_data_length = smb2_read_data_length,
+        .map_error = map_smb2_to_linux_error,
+        .find_mid = smb2_find_mid,
+        .check_message = smb2_check_message,
+        .dump_detail = smb2_dump_detail,
+        .clear_stats = smb2_clear_stats,
+        .print_stats = smb2_print_stats,
+        .is_oplock_break = smb2_is_valid_oplock_break,
+        .need_neg = smb2_need_neg,
+        .negotiate = smb2_negotiate,
+        .negotiate_wsize = smb2_negotiate_wsize,
+        .negotiate_rsize = smb2_negotiate_rsize,
+        .sess_setup = SMB2_sess_setup,
+        .logoff = SMB2_logoff,
+        .tree_connect = SMB2_tcon,
+        .tree_disconnect = SMB2_tdis,
+        .is_path_accessible = smb2_is_path_accessible,
+        .can_echo = smb2_can_echo,
+        .echo = SMB2_echo,
+        .query_path_info = smb2_query_path_info,
+        .get_srv_inum = smb2_get_srv_inum,
+        .query_file_info = smb2_query_file_info,
+        .set_path_size = smb2_set_path_size,
+        .set_file_size = smb2_set_file_size,
+        .set_file_info = smb2_set_file_info,
+        .mkdir = smb2_mkdir,
+        .mkdir_setinfo = smb2_mkdir_setinfo,
+        .rmdir = smb2_rmdir,
+        .unlink = smb2_unlink,
+        .rename = smb2_rename_path,
+        .create_hardlink = smb2_create_hardlink,
+        .open = smb2_open_file,
+        .set_fid = smb2_set_fid,
+        .close = smb2_close_file,
+        .flush = smb2_flush_file,
+        .async_readv = smb2_async_readv,
+        .async_writev = smb2_async_writev,
+        .sync_read = smb2_sync_read,
+        .sync_write = smb2_sync_write,
+        .query_dir_first = smb2_query_dir_first,
+        .query_dir_next = smb2_query_dir_next,
+        .close_dir = smb2_close_dir,
+        .calc_smb_size = smb2_calc_size,
+        .is_status_pending = smb2_is_status_pending,
+        .oplock_response = smb2_oplock_response,
+        .queryfs = smb2_queryfs,
+        .mand_lock = smb2_mand_lock,
+        .mand_unlock_range = smb2_unlock_range,
+        .push_mand_locks = smb2_push_mandatory_locks,
+        .get_lease_key = smb2_get_lease_key,
+        .set_lease_key = smb2_set_lease_key,
+        .new_lease_key = smb2_new_lease_key,
+        .calc_signature = smb3_calc_signature,
 };
 
 struct smb_version_values smb20_values = {
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 7d25f8b14f93..2aa3535e38ce 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -47,6 +47,10 @@ extern struct mid_q_entry *smb2_setup_request(struct cifs_ses *ses,
                               struct smb_rqst *rqst);
 extern struct mid_q_entry *smb2_setup_async_request(
                         struct TCP_Server_Info *server, struct smb_rqst *rqst);
+extern int smb2_calc_signature(struct smb_rqst *rqst,
+                                struct TCP_Server_Info *server);
+extern int smb3_calc_signature(struct smb_rqst *rqst,
+                                struct TCP_Server_Info *server);
 extern void smb2_echo_request(struct work_struct *work);
 extern __le32 smb2_get_lease_state(struct cifsInodeInfo *cinode);
 extern __u8 smb2_map_lease_to_oplock(__le32 lease_state);
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 2a5fdf26f79f..8dd73e61d762 100644
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -39,7 +39,7 @@
 #include "smb2status.h"
 #include "smb2glob.h"
 
-static int
+int
 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 {
         int i, rc;
@@ -116,6 +116,13 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
         return rc;
 }
 
+int
+smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+        cFYI(1, "smb3 signatures not supported yet");
+        return -EOPNOTSUPP;
+}
+
 /* must be called with server->srv_mutex held */
 static int
 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
@@ -132,7 +139,7 @@ smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
                 return rc;
         }
 
-        rc = smb2_calc_signature(rqst, server);
+        rc = server->ops->calc_signature(rqst, server);
 
         return rc;
 }
@@ -168,7 +175,7 @@ smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
         memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE);
 
         mutex_lock(&server->srv_mutex);
-        rc = smb2_calc_signature(rqst, server);
+        rc = server->ops->calc_signature(rqst, server);
         mutex_unlock(&server->srv_mutex);
 
         if (rc)