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Merge tag 'v6.19-rc2-smb3-server-fixes' of git://git.samba.org/ksmbd

Browse Source 
Pull smb server fixes from Steve French:

 - Fix parsing of SMB1 negotiate request by adjusting offsets affected
   by the removal of the RFC1002 length field from the SMB header

 - Update minimum PDU size macros for both SMB1 and SMB2

 - Rename smb2_get_msg function to smb_get_msg to better reflect its
   role in handling both SMB1 and SMB2 requests

* tag 'v6.19-rc2-smb3-server-fixes' of git://git.samba.org/ksmbd:
  smb/server: fix minimum SMB2 PDU size
  smb/server: fix minimum SMB1 PDU size
  ksmbd: rename smb2_get_msg to smb_get_msg
  ksmbd: Fix to handle removal of rfc1002 header from smb_hdr
This commit is contained in:
Linus Torvalds
2025-12-26 10:03:25 -08:00
parent ccd1cdca5c 4c7d8eb9a7
commit e2cc644089
8 changed files with 70 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/smb/server/auth.c
View File

@@ -714,7 +714,7 @@ void ksmbd_gen_smb311_encryptionkey(struct ksmbd_conn *conn,
int ksmbd_gen_preauth_integrity_hash(struct ksmbd_conn *conn, char *buf,
__u8 *pi_hash)
{
struct smb2_hdr *rcv_hdr = smb2_get_msg(buf);
struct smb2_hdr *rcv_hdr = smb_get_msg(buf);
char *all_bytes_msg = (char *)&rcv_hdr->ProtocolId;
int msg_size = get_rfc1002_len(buf);
struct sha512_ctx sha_ctx;
@@ -841,7 +841,7 @@ int ksmbd_crypt_message(struct ksmbd_work *work, struct kvec *iov,
unsigned int nvec, int enc)
{
struct ksmbd_conn *conn = work->conn;
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(iov[0].iov_base);
struct smb2_transform_hdr *tr_hdr = smb_get_msg(iov[0].iov_base);
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
int rc;
struct scatterlist *sg;

11
fs/smb/server/connection.c
View File

@@ -295,8 +295,9 @@ bool ksmbd_conn_alive(struct ksmbd_conn *conn)
return true;
}
#define SMB1_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb_hdr))
#define SMB2_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb2_hdr) + 4)
/* "+2" for BCC field (ByteCount, 2 bytes) */
#define SMB1_MIN_SUPPORTED_PDU_SIZE (sizeof(struct smb_hdr) + 2)
#define SMB2_MIN_SUPPORTED_PDU_SIZE (sizeof(struct smb2_pdu))
/**
* ksmbd_conn_handler_loop() - session thread to listen on new smb requests
@@ -363,7 +364,7 @@ int ksmbd_conn_handler_loop(void *p)
if (pdu_size > MAX_STREAM_PROT_LEN)
break;
if (pdu_size < SMB1_MIN_SUPPORTED_HEADER_SIZE)
if (pdu_size < SMB1_MIN_SUPPORTED_PDU_SIZE)
break;
/* 4 for rfc1002 length field */
@@ -394,9 +395,9 @@ int ksmbd_conn_handler_loop(void *p)
if (!ksmbd_smb_request(conn))
break;
if (((struct smb2_hdr *)smb2_get_msg(conn->request_buf))->ProtocolId ==
if (((struct smb2_hdr *)smb_get_msg(conn->request_buf))->ProtocolId ==
SMB2_PROTO_NUMBER) {
if (pdu_size < SMB2_MIN_SUPPORTED_HEADER_SIZE)
if (pdu_size < SMB2_MIN_SUPPORTED_PDU_SIZE)
break;
}

8
fs/smb/server/oplock.c
View File

@@ -637,7 +637,7 @@ static void __smb2_oplock_break_noti(struct work_struct *wk)
goto out;
}
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr = smb_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
@@ -651,7 +651,7 @@ static void __smb2_oplock_break_noti(struct work_struct *wk)
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = smb2_get_msg(work->response_buf);
rsp = smb_get_msg(work->response_buf);
rsp->StructureSize = cpu_to_le16(24);
if (!br_info->open_trunc &&
@@ -744,7 +744,7 @@ static void __smb2_lease_break_noti(struct work_struct *wk)
goto out;
}
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr = smb_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
@@ -758,7 +758,7 @@ static void __smb2_lease_break_noti(struct work_struct *wk)
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = smb2_get_msg(work->response_buf);
rsp = smb_get_msg(work->response_buf);
rsp->StructureSize = cpu_to_le16(44);
rsp->Epoch = br_info->epoch;
rsp->Flags = 0;

2
fs/smb/server/server.c
View File

@@ -95,7 +95,7 @@ static inline int check_conn_state(struct ksmbd_work *work)
if (ksmbd_conn_exiting(work->conn) ||
ksmbd_conn_need_reconnect(work->conn)) {
rsp_hdr = work->response_buf;
rsp_hdr = smb_get_msg(work->response_buf);
rsp_hdr->Status.CifsError = STATUS_CONNECTION_DISCONNECTED;
return 1;
}

70
fs/smb/server/smb2pdu.c
View File

@@ -47,8 +47,8 @@ static void __wbuf(struct ksmbd_work *work, void **req, void **rsp)
*req = ksmbd_req_buf_next(work);
*rsp = ksmbd_resp_buf_next(work);
} else {
*req = smb2_get_msg(work->request_buf);
*rsp = smb2_get_msg(work->response_buf);
*req = smb_get_msg(work->request_buf);
*rsp = smb_get_msg(work->response_buf);
}
}
@@ -146,7 +146,7 @@ void smb2_set_err_rsp(struct ksmbd_work *work)
if (work->next_smb2_rcv_hdr_off)
err_rsp = ksmbd_resp_buf_next(work);
else
err_rsp = smb2_get_msg(work->response_buf);
err_rsp = smb_get_msg(work->response_buf);
if (err_rsp->hdr.Status != STATUS_STOPPED_ON_SYMLINK) {
int err;
@@ -172,7 +172,7 @@ void smb2_set_err_rsp(struct ksmbd_work *work)
*/
bool is_smb2_neg_cmd(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *hdr = smb_get_msg(work->request_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
@@ -196,7 +196,7 @@ bool is_smb2_neg_cmd(struct ksmbd_work *work)
*/
bool is_smb2_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->response_buf);
struct smb2_hdr *hdr = smb_get_msg(work->response_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
@@ -222,7 +222,7 @@ u16 get_smb2_cmd_val(struct ksmbd_work *work)
if (work->next_smb2_rcv_hdr_off)
rcv_hdr = ksmbd_req_buf_next(work);
else
rcv_hdr = smb2_get_msg(work->request_buf);
rcv_hdr = smb_get_msg(work->request_buf);
return le16_to_cpu(rcv_hdr->Command);
}
@@ -235,7 +235,7 @@ void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err)
{
struct smb2_hdr *rsp_hdr;
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr = smb_get_msg(work->response_buf);
rsp_hdr->Status = err;
work->iov_idx = 0;
@@ -258,7 +258,7 @@ int init_smb2_neg_rsp(struct ksmbd_work *work)
struct ksmbd_conn *conn = work->conn;
int err;
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr = smb_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
@@ -272,7 +272,7 @@ int init_smb2_neg_rsp(struct ksmbd_work *work)
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = smb2_get_msg(work->response_buf);
rsp = smb_get_msg(work->response_buf);
WARN_ON(ksmbd_conn_good(conn));
@@ -446,7 +446,7 @@ static void init_chained_smb2_rsp(struct ksmbd_work *work)
*/
bool is_chained_smb2_message(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *hdr = smb_get_msg(work->request_buf);
unsigned int len, next_cmd;
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
@@ -497,8 +497,8 @@ bool is_chained_smb2_message(struct ksmbd_work *work)
*/
int init_smb2_rsp_hdr(struct ksmbd_work *work)
{
struct smb2_hdr *rsp_hdr = smb2_get_msg(work->response_buf);
struct smb2_hdr *rcv_hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *rsp_hdr = smb_get_msg(work->response_buf);
struct smb2_hdr *rcv_hdr = smb_get_msg(work->request_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
@@ -527,7 +527,7 @@ int init_smb2_rsp_hdr(struct ksmbd_work *work)
*/
int smb2_allocate_rsp_buf(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *hdr = smb_get_msg(work->request_buf);
size_t small_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
size_t large_sz = small_sz + work->conn->vals->max_trans_size;
size_t sz = small_sz;
@@ -543,7 +543,7 @@ int smb2_allocate_rsp_buf(struct ksmbd_work *work)
offsetof(struct smb2_query_info_req, OutputBufferLength))
return -EINVAL;
req = smb2_get_msg(work->request_buf);
req = smb_get_msg(work->request_buf);
if ((req->InfoType == SMB2_O_INFO_FILE &&
(req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
req->FileInfoClass == FILE_ALL_INFORMATION)) ||
@@ -712,10 +712,10 @@ void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
}
in_work->conn = work->conn;
memcpy(smb2_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
memcpy(smb_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
__SMB2_HEADER_STRUCTURE_SIZE);
rsp_hdr = smb2_get_msg(in_work->response_buf);
rsp_hdr = smb_get_msg(in_work->response_buf);
rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;
rsp_hdr->Id.AsyncId = cpu_to_le64(work->async_id);
smb2_set_err_rsp(in_work);
@@ -1093,8 +1093,8 @@ static __le32 deassemble_neg_contexts(struct ksmbd_conn *conn,
int smb2_handle_negotiate(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
struct smb2_negotiate_req *req = smb2_get_msg(work->request_buf);
struct smb2_negotiate_rsp *rsp = smb2_get_msg(work->response_buf);
struct smb2_negotiate_req *req = smb_get_msg(work->request_buf);
struct smb2_negotiate_rsp *rsp = smb_get_msg(work->response_buf);
int rc = 0;
unsigned int smb2_buf_len, smb2_neg_size, neg_ctxt_len = 0;
__le32 status;
@@ -5967,7 +5967,7 @@ int smb2_close(struct ksmbd_work *work)
*/
int smb2_echo(struct ksmbd_work *work)
{
struct smb2_echo_rsp *rsp = smb2_get_msg(work->response_buf);
struct smb2_echo_rsp *rsp = smb_get_msg(work->response_buf);
ksmbd_debug(SMB, "Received smb2 echo request\n");
@@ -6520,8 +6520,8 @@ int smb2_set_info(struct ksmbd_work *work)
pid = work->compound_pfid;
}
} else {
req = smb2_get_msg(work->request_buf);
rsp = smb2_get_msg(work->response_buf);
req = smb_get_msg(work->request_buf);
rsp = smb_get_msg(work->response_buf);
}
if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
@@ -6754,8 +6754,8 @@ int smb2_read(struct ksmbd_work *work)
pid = work->compound_pfid;
}
} else {
req = smb2_get_msg(work->request_buf);
rsp = smb2_get_msg(work->response_buf);
req = smb_get_msg(work->request_buf);
rsp = smb_get_msg(work->response_buf);
}
if (!has_file_id(id)) {
@@ -7183,7 +7183,7 @@ int smb2_flush(struct ksmbd_work *work)
int smb2_cancel(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *hdr = smb_get_msg(work->request_buf);
struct smb2_hdr *chdr;
struct ksmbd_work *iter;
struct list_head *command_list;
@@ -7200,7 +7200,7 @@ int smb2_cancel(struct ksmbd_work *work)
spin_lock(&conn->request_lock);
list_for_each_entry(iter, command_list,
async_request_entry) {
chdr = smb2_get_msg(iter->request_buf);
chdr = smb_get_msg(iter->request_buf);
if (iter->async_id !=
le64_to_cpu(hdr->Id.AsyncId))
@@ -7221,7 +7221,7 @@ int smb2_cancel(struct ksmbd_work *work)
spin_lock(&conn->request_lock);
list_for_each_entry(iter, command_list, request_entry) {
chdr = smb2_get_msg(iter->request_buf);
chdr = smb_get_msg(iter->request_buf);
if (chdr->MessageId != hdr->MessageId ||
iter == work)
@@ -8151,8 +8151,8 @@ int smb2_ioctl(struct ksmbd_work *work)
id = work->compound_fid;
}
} else {
req = smb2_get_msg(work->request_buf);
rsp = smb2_get_msg(work->response_buf);
req = smb_get_msg(work->request_buf);
rsp = smb_get_msg(work->response_buf);
}
if (!has_file_id(id))
@@ -8817,7 +8817,7 @@ int smb2_notify(struct ksmbd_work *work)
*/
bool smb2_is_sign_req(struct ksmbd_work *work, unsigned int command)
{
struct smb2_hdr *rcv_hdr2 = smb2_get_msg(work->request_buf);
struct smb2_hdr *rcv_hdr2 = smb_get_msg(work->request_buf);
if ((rcv_hdr2->Flags & SMB2_FLAGS_SIGNED) &&
command != SMB2_NEGOTIATE_HE &&
@@ -8842,7 +8842,7 @@ int smb2_check_sign_req(struct ksmbd_work *work)
struct kvec iov[1];
size_t len;
hdr = smb2_get_msg(work->request_buf);
hdr = smb_get_msg(work->request_buf);
if (work->next_smb2_rcv_hdr_off)
hdr = ksmbd_req_buf_next(work);
@@ -8916,7 +8916,7 @@ int smb3_check_sign_req(struct ksmbd_work *work)
struct kvec iov[1];
size_t len;
hdr = smb2_get_msg(work->request_buf);
hdr = smb_get_msg(work->request_buf);
if (work->next_smb2_rcv_hdr_off)
hdr = ksmbd_req_buf_next(work);
@@ -9049,7 +9049,7 @@ void smb3_preauth_hash_rsp(struct ksmbd_work *work)
static void fill_transform_hdr(void *tr_buf, char *old_buf, __le16 cipher_type)
{
struct smb2_transform_hdr *tr_hdr = tr_buf + 4;
struct smb2_hdr *hdr = smb2_get_msg(old_buf);
struct smb2_hdr *hdr = smb_get_msg(old_buf);
unsigned int orig_len = get_rfc1002_len(old_buf);
/* tr_buf must be cleared by the caller */
@@ -9088,7 +9088,7 @@ int smb3_encrypt_resp(struct ksmbd_work *work)
bool smb3_is_transform_hdr(void *buf)
{
struct smb2_transform_hdr *trhdr = smb2_get_msg(buf);
struct smb2_transform_hdr *trhdr = smb_get_msg(buf);
return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
}
@@ -9100,7 +9100,7 @@ int smb3_decrypt_req(struct ksmbd_work *work)
unsigned int pdu_length = get_rfc1002_len(buf);
struct kvec iov[2];
int buf_data_size = pdu_length - sizeof(struct smb2_transform_hdr);
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(buf);
struct smb2_transform_hdr *tr_hdr = smb_get_msg(buf);
int rc = 0;
if (pdu_length < sizeof(struct smb2_transform_hdr) ||
@@ -9141,7 +9141,7 @@ bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
struct ksmbd_session *sess = work->sess;
struct smb2_hdr *rsp = smb2_get_msg(work->response_buf);
struct smb2_hdr *rsp = smb_get_msg(work->response_buf);
if (conn->dialect < SMB30_PROT_ID)
return false;

9
fs/smb/server/smb2pdu.h
View File

@@ -383,15 +383,6 @@ int smb2_ioctl(struct ksmbd_work *work);
int smb2_oplock_break(struct ksmbd_work *work);
int smb2_notify(struct ksmbd_work *ksmbd_work);
/*
* Get the body of the smb2 message excluding the 4 byte rfc1002 headers
* from request/response buffer.
*/
static inline void *smb2_get_msg(void *buf)
{
return buf + 4;
}
#define POSIX_TYPE_FILE 0
#define POSIX_TYPE_DIR 1
#define POSIX_TYPE_SYMLINK 2

26
fs/smb/server/smb_common.c
View File

@@ -140,7 +140,7 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work)
if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
return ksmbd_smb2_check_message(work);
hdr = work->request_buf;
hdr = smb_get_msg(work->request_buf);
if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
hdr->Command == SMB_COM_NEGOTIATE) {
work->conn->outstanding_credits++;
@@ -163,7 +163,7 @@ bool ksmbd_smb_request(struct ksmbd_conn *conn)
if (conn->request_buf[0] != 0)
return false;
proto = (__le32 *)smb2_get_msg(conn->request_buf);
proto = (__le32 *)smb_get_msg(conn->request_buf);
if (*proto == SMB2_COMPRESSION_TRANSFORM_ID) {
pr_err_ratelimited("smb2 compression not support yet");
return false;
@@ -259,14 +259,14 @@ int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count)
static int ksmbd_negotiate_smb_dialect(void *buf)
{
int smb_buf_length = get_rfc1002_len(buf);
__le32 proto = ((struct smb2_hdr *)smb2_get_msg(buf))->ProtocolId;
__le32 proto = ((struct smb2_hdr *)smb_get_msg(buf))->ProtocolId;
if (proto == SMB2_PROTO_NUMBER) {
struct smb2_negotiate_req *req;
int smb2_neg_size =
offsetof(struct smb2_negotiate_req, Dialects);
req = (struct smb2_negotiate_req *)smb2_get_msg(buf);
req = (struct smb2_negotiate_req *)smb_get_msg(buf);
if (smb2_neg_size > smb_buf_length)
goto err_out;
@@ -278,15 +278,14 @@ static int ksmbd_negotiate_smb_dialect(void *buf)
req->DialectCount);
}
proto = *(__le32 *)((struct smb_hdr *)buf)->Protocol;
if (proto == SMB1_PROTO_NUMBER) {
struct smb_negotiate_req *req;
req = (struct smb_negotiate_req *)buf;
req = (struct smb_negotiate_req *)smb_get_msg(buf);
if (le16_to_cpu(req->ByteCount) < 2)
goto err_out;
if (offsetof(struct smb_negotiate_req, DialectsArray) - 4 +
if (offsetof(struct smb_negotiate_req, DialectsArray) +
le16_to_cpu(req->ByteCount) > smb_buf_length) {
goto err_out;
}
@@ -320,8 +319,8 @@ static u16 get_smb1_cmd_val(struct ksmbd_work *work)
*/
static int init_smb1_rsp_hdr(struct ksmbd_work *work)
{
struct smb_hdr *rsp_hdr = (struct smb_hdr *)work->response_buf;
struct smb_hdr *rcv_hdr = (struct smb_hdr *)work->request_buf;
struct smb_hdr *rsp_hdr = (struct smb_hdr *)smb_get_msg(work->response_buf);
struct smb_hdr *rcv_hdr = (struct smb_hdr *)smb_get_msg(work->request_buf);
rsp_hdr->Command = SMB_COM_NEGOTIATE;
*(__le32 *)rsp_hdr->Protocol = SMB1_PROTO_NUMBER;
@@ -412,9 +411,10 @@ static int init_smb1_server(struct ksmbd_conn *conn)
int ksmbd_init_smb_server(struct ksmbd_conn *conn)
{
struct smb_hdr *rcv_hdr = (struct smb_hdr *)smb_get_msg(conn->request_buf);
__le32 proto;
proto = *(__le32 *)((struct smb_hdr *)conn->request_buf)->Protocol;
proto = *(__le32 *)rcv_hdr->Protocol;
if (conn->need_neg == false) {
if (proto == SMB1_PROTO_NUMBER)
return -EINVAL;
@@ -572,12 +572,12 @@ static int __smb2_negotiate(struct ksmbd_conn *conn)
static int smb_handle_negotiate(struct ksmbd_work *work)
{
struct smb_negotiate_rsp *neg_rsp = work->response_buf;
struct smb_negotiate_rsp *neg_rsp = smb_get_msg(work->response_buf);
ksmbd_debug(SMB, "Unsupported SMB1 protocol\n");
if (ksmbd_iov_pin_rsp(work, (void *)neg_rsp + 4,
sizeof(struct smb_negotiate_rsp) - 4))
if (ksmbd_iov_pin_rsp(work, (void *)neg_rsp,
sizeof(struct smb_negotiate_rsp)))
return -ENOMEM;
neg_rsp->hdr.Status.CifsError = STATUS_SUCCESS;

9
fs/smb/server/smb_common.h
View File

@@ -203,4 +203,13 @@ unsigned int ksmbd_server_side_copy_max_chunk_size(void);
unsigned int ksmbd_server_side_copy_max_total_size(void);
bool is_asterisk(char *p);
__le32 smb_map_generic_desired_access(__le32 daccess);
/*
* Get the body of the smb message excluding the 4 byte rfc1002 headers
* from request/response buffer.
*/
static inline void *smb_get_msg(void *buf)
{
return buf + 4;
}
#endif /* __SMB_SERVER_COMMON_H__ */