smb3: rename encryption/decryption TFMs

Detach the TFM name from a specific algorithm (AES-CCM) as
AES-GCM is also supported, making the name misleading.

s/ccmaesencrypt/enc/
s/ccmaesdecrypt/dec/

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: ematsumiya

fs/cifs/cifsencrypt.c

@@ -743,14 +743,14 @@ cifs_crypto_secmech_release(struct TCP_Server_Info *server)
 		server->secmech.hmacmd5 = NULL;
 	}
 
-	if (server->secmech.ccmaesencrypt) {
-		crypto_free_aead(server->secmech.ccmaesencrypt);
-		server->secmech.ccmaesencrypt = NULL;
+	if (server->secmech.enc) {
+		crypto_free_aead(server->secmech.enc);
+		server->secmech.enc = NULL;
 	}
 
-	if (server->secmech.ccmaesdecrypt) {
-		crypto_free_aead(server->secmech.ccmaesdecrypt);
-		server->secmech.ccmaesdecrypt = NULL;
+	if (server->secmech.dec) {
+		crypto_free_aead(server->secmech.dec);
+		server->secmech.dec = NULL;
 	}
 
 	kfree_sensitive(server->secmech.sdesccmacaes);

fs/cifs/cifsglob.h

@@ -171,8 +171,8 @@ struct cifs_secmech {
 	struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
 	struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
 	struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
-	struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
-	struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
+	struct crypto_aead *enc; /* smb3 AEAD encryption TFM (AES-CCM and AES-GCM) */
+	struct crypto_aead *dec; /* smb3 AEAD decryption TFM (AES-CCM and AES-GCM) */
 };
 
 /* per smb session structure/fields */

fs/cifs/smb2ops.c

@@ -4357,8 +4357,7 @@ crypt_message(struct TCP_Server_Info *server, int num_rqst,
 		return rc;
 	}
 
-	tfm = enc ? server->secmech.ccmaesencrypt :
-						server->secmech.ccmaesdecrypt;
+	tfm = enc ? server->secmech.enc : server->secmech.dec;
 
 	if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
 		(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))

fs/cifs/smb2transport.c

@@ -904,7 +904,7 @@ smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
 {
 	struct crypto_aead *tfm;
 
-	if (!server->secmech.ccmaesencrypt) {
+	if (!server->secmech.enc) {
 		if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
 		    (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
 			tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
@@ -915,23 +915,23 @@ smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
 				 __func__);
 			return PTR_ERR(tfm);
 		}
-		server->secmech.ccmaesencrypt = tfm;
+		server->secmech.enc = tfm;
 	}
 
-	if (!server->secmech.ccmaesdecrypt) {
+	if (!server->secmech.dec) {
 		if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
 		    (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
 			tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
 		else
 			tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
 		if (IS_ERR(tfm)) {
-			crypto_free_aead(server->secmech.ccmaesencrypt);
-			server->secmech.ccmaesencrypt = NULL;
+			crypto_free_aead(server->secmech.enc);
+			server->secmech.enc = NULL;
 			cifs_server_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
 				 __func__);
 			return PTR_ERR(tfm);
 		}
-		server->secmech.ccmaesdecrypt = tfm;
+		server->secmech.dec = tfm;
 	}
 
 	return 0;