[RFC PATCH v2 3/3] cifs: show signing algorithm name in DebugData

[Enzo Matsumiya <ematsumiya@suse.de>]

- Move smb3_signing_algo_str() to smb2glob.h
- Rename it to smb2_signing_algo_str()
- Add a case for HMAC-SHA256
- Show the algorithm name in DebugData, when signing is enabled

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
---
 fs/cifs/cifs_debug.c |  7 +++++--
 fs/cifs/smb2glob.h   | 10 ++++++++++
 fs/cifs/smb2pdu.c    | 13 +------------
 3 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index c05477e28cff..86a5fb93f07f 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -13,6 +13,7 @@
 #include <linux/uaccess.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
+#include "smb2glob.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifsfs.h"
@@ -354,7 +355,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 		else if (server->compress_algorithm == SMB3_COMPRESS_LZ77_HUFF)
 			seq_printf(m, " COMPRESS_LZ77_HUFF");
 		if (server->sign)
-			seq_printf(m, " signed");
+			seq_printf(m, " signed (%s)",
+				   smb2_signing_algo_str(server->signing_algorithm));
 		if (server->posix_ext_supported)
 			seq_printf(m, " posix");
 		if (server->nosharesock)
@@ -405,7 +407,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 			if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 				seq_puts(m, " encrypted");
 			if (ses->sign)
-				seq_puts(m, " signed");
+				seq_printf(m, " signed (%s)",
+				   smb2_signing_algo_str(server->signing_algorithm));
 
 			seq_printf(m, "\n\tUser: %d Cred User: %d",
 				   from_kuid(&init_user_ns, ses->linux_uid),
diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h
index 82e916ad167c..3a3e81b1b8cb 100644
--- a/fs/cifs/smb2glob.h
+++ b/fs/cifs/smb2glob.h
@@ -41,4 +41,14 @@
 #define END_OF_CHAIN 4
 #define RELATED_REQUEST 8
 
+static inline const char *smb2_signing_algo_str(u16 algo)
+{
+	switch (algo) {
+	case SIGNING_ALG_HMAC_SHA256: return "HMAC-SHA256";
+	case SIGNING_ALG_AES_CMAC: return "AES-CMAC";
+	case SIGNING_ALG_AES_GMAC: return "AES-GMAC";
+	default: return "unknown algorithm";
+	}
+}
+
 #endif	/* _SMB2_GLOB_H */
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index d51dfe3bb163..11d1cb7d7ff6 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -716,17 +716,6 @@ static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 	return 0;
 }
 
-/* XXX: maybe move this somewhere else? */
-static const char *smb3_signing_algo_str(u16 algo)
-{
-	switch (algo) {
-	case SIGNING_ALG_AES_CMAC: return "AES-CMAC";
-	case SIGNING_ALG_AES_GMAC: return "AES-GMAC";
-	/* HMAC-SHA256 is unused in SMB3+ context */
-	default: return "unknown";
-	}
-}
-
 static void decode_signing_ctx(struct TCP_Server_Info *server,
 			       struct smb2_signing_capabilities *pctxt)
 {
@@ -757,7 +746,7 @@ static void decode_signing_ctx(struct TCP_Server_Info *server,
 	/* AES-CMAC is already the default, in case AES-GMAC wasn't negotiated */
 
 	cifs_dbg(FYI, "negotiated signing algorithm '%s'\n",
-		 smb3_signing_algo_str(server->signing_algorithm));
+		 smb2_signing_algo_str(server->signing_algorithm));
 }
 
 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
-- 
2.35.3