Re: [SMB3] New compression flags

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And one more small set of structures for the updated transform header.
See MS-SMB2 2.2.42.1 and 2.2.42.2


On Sun, Mar 15, 2020 at 5:50 PM Steve French <smfrench@xxxxxxxxx> wrote:
>
> Some compression related flags I noticed were added in the latest MS-SMB2
>
>
>
> --
> Thanks,
>
> Steve



-- 
Thanks,

Steve
From eeb672fc5e0ec07d355a0d782a20f9cd28f34be7 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Sun, 15 Mar 2020 18:04:13 -0500
Subject: [PATCH] SMB3: Additional compression structures

New transform header structures. See recent updates
to MS-SMB2 adding section 2.2.42.1 and 2.2.42.2

Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
---
 fs/cifs/smb2pdu.h | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 4a7d154fffae..8b8fbbc464c7 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -137,6 +137,21 @@ struct smb2_transform_hdr {
 	__u64  SessionId;
 } __packed;
 
+/* See MS-SMB2 2.2.42.1 */
+struct compression_playload_header {
+	__le16	AlgorithmId;
+	__le16	Reserved;
+	__le32	Length;
+} __packed;
+
+/* See MS-SMB2 2.2.42.2 */
+struct compression_pattern_payload_v1 {
+	__le16	Pattern;
+	__le16	Reserved1;
+	__le16	Reserved2;
+	__le32	Repititions;
+} __packed;
+
 /*
  *	SMB2 flag definitions
  */
@@ -1186,7 +1201,7 @@ struct smb2_write_req {
 	__le64 Offset;
 	__u64  PersistentFileId; /* opaque endianness */
 	__u64  VolatileFileId; /* opaque endianness */
-	__le32 Channel; /* Reserved MBZ */
+	__le32 Channel; /* MBZ unless SMB3.02 or later */
 	__le32 RemainingBytes;
 	__le16 WriteChannelInfoOffset;
 	__le16 WriteChannelInfoLength;
-- 
2.20.1


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