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path: root/fs/cifs/smb2pdu.c
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Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r--fs/cifs/smb2pdu.c46
1 files changed, 45 insertions, 1 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 035a568b3dbd..29f011d8d8e2 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -473,6 +473,19 @@ build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
}
static void
+build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
+{
+ pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
+ pneg_ctxt->DataLength =
+ cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
+ - sizeof(struct smb2_neg_context));
+ pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
+ pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
+ pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
+ pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
+}
+
+static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
@@ -538,10 +551,17 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
+ build_compression_ctxt((struct smb2_compression_capabilities_context *)
+ pneg_ctxt);
+ ctxt_len = DIV_ROUND_UP(
+ sizeof(struct smb2_compression_capabilities_context), 8) * 8;
+ *total_len += ctxt_len;
+ pneg_ctxt += ctxt_len;
+
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
- req->NegotiateContextCount = cpu_to_le16(3);
+ req->NegotiateContextCount = cpu_to_le16(4);
}
static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
@@ -559,6 +579,27 @@ static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
}
+static void decode_compress_ctx(struct TCP_Server_Info *server,
+ struct smb2_compression_capabilities_context *ctxt)
+{
+ unsigned int len = le16_to_cpu(ctxt->DataLength);
+
+ /* sizeof compress context is a one element compression capbility struct */
+ if (len < 10) {
+ printk_once(KERN_WARNING "server sent bad compression cntxt\n");
+ return;
+ }
+ if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
+ printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
+ return;
+ }
+ if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
+ printk_once(KERN_WARNING "unknown compression algorithm\n");
+ return;
+ }
+ server->compress_algorithm = ctxt->CompressionAlgorithms[0];
+}
+
static int decode_encrypt_ctx(struct TCP_Server_Info *server,
struct smb2_encryption_neg_context *ctxt)
{
@@ -623,6 +664,9 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
rc = decode_encrypt_ctx(server,
(struct smb2_encryption_neg_context *)pctx);
+ else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
+ decode_compress_ctx(server,
+ (struct smb2_compression_capabilities_context *)pctx);
else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
server->posix_ext_supported = true;
else