diff options
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 46 |
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 |