fs/ksmbd/smb2pdu.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/inetdevice.h>
#include <net/addrconf.h>
#include <linux/syscalls.h>
#include <linux/namei.h>
#include <linux/statfs.h>
#include <linux/ethtool.h>
#include <linux/falloc.h>

#include "glob.h"
#include "smbfsctl.h"
#include "oplock.h"
#include "smbacl.h"

#include "auth.h"
#include "asn1.h"
#include "connection.h"
#include "transport_ipc.h"
#include "transport_rdma.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "misc.h"

#include "server.h"
#include "smb_common.h"
#include "smbstatus.h"
#include "ksmbd_work.h"
#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/ksmbd_ida.h"
#include "ndr.h"

static void __wbuf(struct ksmbd_work *work, void **req, void **rsp)
{
	if (work->next_smb2_rcv_hdr_off) {
		*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);
	}
}

#define WORK_BUFFERS(w, rq, rs)	__wbuf((w), (void **)&(rq), (void **)&(rs))

/**
 * check_session_id() - check for valid session id in smb header
 * @conn:	connection instance
 * @id:		session id from smb header
 *
 * Return:      1 if valid session id, otherwise 0
 */
static inline bool check_session_id(struct ksmbd_conn *conn, u64 id)
{
	struct ksmbd_session *sess;

	if (id == 0 || id == -1)
		return false;

	sess = ksmbd_session_lookup_all(conn, id);
	if (sess)
		return true;
	pr_err("Invalid user session id: %llu\n", id);
	return false;
}

struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn *conn)
{
	struct channel *chann;

	list_for_each_entry(chann, &sess->ksmbd_chann_list, chann_list) {
		if (chann->conn == conn)
			return chann;
	}

	return NULL;
}

/**
 * smb2_get_ksmbd_tcon() - get tree connection information using a tree id.
 * @work:	smb work
 *
 * Return:	0 if there is a tree connection matched or these are
 *		skipable commands, otherwise error
 */
int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
{
	struct smb2_hdr *req_hdr = smb2_get_msg(work->request_buf);
	unsigned int cmd = le16_to_cpu(req_hdr->Command);
	int tree_id;

	work->tcon = NULL;
	if (cmd == SMB2_TREE_CONNECT_HE ||
	    cmd ==  SMB2_CANCEL_HE ||
	    cmd ==  SMB2_LOGOFF_HE) {
		ksmbd_debug(SMB, "skip to check tree connect request\n");
		return 0;
	}

	if (xa_empty(&work->sess->tree_conns)) {
		ksmbd_debug(SMB, "NO tree connected\n");
		return -ENOENT;
	}

	tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
	work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
	if (!work->tcon) {
		pr_err("Invalid tid %d\n", tree_id);
		return -EINVAL;
	}

	return 1;
}

/**
 * smb2_set_err_rsp() - set error response code on smb response
 * @work:	smb work containing response buffer
 */
void smb2_set_err_rsp(struct ksmbd_work *work)
{
	struct smb2_err_rsp *err_rsp;

	if (work->next_smb2_rcv_hdr_off)
		err_rsp = ksmbd_resp_buf_next(work);
	else
		err_rsp = smb2_get_msg(work->response_buf);

	if (err_rsp->hdr.Status != STATUS_STOPPED_ON_SYMLINK) {
		err_rsp->StructureSize = SMB2_ERROR_STRUCTURE_SIZE2_LE;
		err_rsp->ErrorContextCount = 0;
		err_rsp->Reserved = 0;
		err_rsp->ByteCount = 0;
		err_rsp->ErrorData[0] = 0;
		inc_rfc1001_len(work->response_buf, SMB2_ERROR_STRUCTURE_SIZE2);
	}
}

/**
 * is_smb2_neg_cmd() - is it smb2 negotiation command
 * @work:	smb work containing smb header
 *
 * Return:      true if smb2 negotiation command, otherwise false
 */
bool is_smb2_neg_cmd(struct ksmbd_work *work)
{
	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);

	/* is it SMB2 header ? */
	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
		return false;

	/* make sure it is request not response message */
	if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
		return false;

	if (hdr->Command != SMB2_NEGOTIATE)
		return false;

	return true;
}

/**
 * is_smb2_rsp() - is it smb2 response
 * @work:	smb work containing smb response buffer
 *
 * Return:      true if smb2 response, otherwise false
 */
bool is_smb2_rsp(struct ksmbd_work *work)
{
	struct smb2_hdr *hdr = smb2_get_msg(work->response_buf);

	/* is it SMB2 header ? */
	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
		return false;

	/* make sure it is response not request message */
	if (!(hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR))
		return false;

	return true;
}

/**
 * get_smb2_cmd_val() - get smb command code from smb header
 * @work:	smb work containing smb request buffer
 *
 * Return:      smb2 request command value
 */
u16 get_smb2_cmd_val(struct ksmbd_work *work)
{
	struct smb2_hdr *rcv_hdr;

	if (work->next_smb2_rcv_hdr_off)
		rcv_hdr = ksmbd_req_buf_next(work);
	else
		rcv_hdr = smb2_get_msg(work->request_buf);
	return le16_to_cpu(rcv_hdr->Command);
}

/**
 * set_smb2_rsp_status() - set error response code on smb2 header
 * @work:	smb work containing response buffer
 * @err:	error response code
 */
void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err)
{
	struct smb2_hdr *rsp_hdr;

	if (work->next_smb2_rcv_hdr_off)
		rsp_hdr = ksmbd_resp_buf_next(work);
	else
		rsp_hdr = smb2_get_msg(work->response_buf);
	rsp_hdr->Status = err;
	smb2_set_err_rsp(work);
}

/**
 * init_smb2_neg_rsp() - initialize smb2 response for negotiate command
 * @work:	smb work containing smb request buffer
 *
 * smb2 negotiate response is sent in reply of smb1 negotiate command for
 * dialect auto-negotiation.
 */
int init_smb2_neg_rsp(struct ksmbd_work *work)
{
	struct smb2_hdr *rsp_hdr;
	struct smb2_negotiate_rsp *rsp;
	struct ksmbd_conn *conn = work->conn;

	if (conn->need_neg == false)
		return -EINVAL;

	*(__be32 *)work->response_buf =
		cpu_to_be32(conn->vals->header_size);

	rsp_hdr = smb2_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;
	rsp_hdr->CreditRequest = cpu_to_le16(2);
	rsp_hdr->Command = SMB2_NEGOTIATE;
	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
	rsp_hdr->NextCommand = 0;
	rsp_hdr->MessageId = 0;
	rsp_hdr->Id.SyncId.ProcessId = 0;
	rsp_hdr->Id.SyncId.TreeId = 0;
	rsp_hdr->SessionId = 0;
	memset(rsp_hdr->Signature, 0, 16);

	rsp = smb2_get_msg(work->response_buf);

	WARN_ON(ksmbd_conn_good(work));

	rsp->StructureSize = cpu_to_le16(65);
	ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
	rsp->DialectRevision = cpu_to_le16(conn->dialect);
	/* Not setting conn guid rsp->ServerGUID, as it
	 * not used by client for identifying connection
	 */
	rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
	/* Default Max Message Size till SMB2.0, 64K*/
	rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
	rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
	rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);

	rsp->SystemTime = cpu_to_le64(ksmbd_systime());
	rsp->ServerStartTime = 0;

	rsp->SecurityBufferOffset = cpu_to_le16(128);
	rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
	ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
		le16_to_cpu(rsp->SecurityBufferOffset));
	inc_rfc1001_len(work->response_buf,
			sizeof(struct smb2_negotiate_rsp) -
			sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
			AUTH_GSS_LENGTH);
	rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
	if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY)
		rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
	conn->use_spnego = true;

	ksmbd_conn_set_need_negotiate(work);
	return 0;
}

/**
 * smb2_set_rsp_credits() - set number of credits in response buffer
 * @work:	smb work containing smb response buffer
 */
int smb2_set_rsp_credits(struct ksmbd_work *work)
{
	struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
	struct smb2_hdr *hdr = ksmbd_resp_buf_next(work);
	struct ksmbd_conn *conn = work->conn;
	unsigned short credits_requested;
	unsigned short credit_charge, credits_granted = 0;
	unsigned short aux_max, aux_credits;

	if (work->send_no_response)
		return 0;

	hdr->CreditCharge = req_hdr->CreditCharge;

	if (conn->total_credits > conn->max_credits) {
		hdr->CreditRequest = 0;
		pr_err("Total credits overflow: %d\n", conn->total_credits);
		return -EINVAL;
	}

	credit_charge = max_t(unsigned short,
			      le16_to_cpu(req_hdr->CreditCharge), 1);
	credits_requested = max_t(unsigned short,
				  le16_to_cpu(req_hdr->CreditRequest), 1);

	/* according to smb2.credits smbtorture, Windows server
	 * 2016 or later grant up to 8192 credits at once.
	 *
	 * TODO: Need to adjuct CreditRequest value according to
	 * current cpu load
	 */
	aux_credits = credits_requested - 1;
	if (hdr->Command == SMB2_NEGOTIATE)
		aux_max = 0;
	else
		aux_max = conn->max_credits - credit_charge;
	aux_credits = min_t(unsigned short, aux_credits, aux_max);
	credits_granted = credit_charge + aux_credits;

	if (conn->max_credits - conn->total_credits < credits_granted)
		credits_granted = conn->max_credits -
			conn->total_credits;

	conn->total_credits += credits_granted;
	work->credits_granted += credits_granted;

	if (!req_hdr->NextCommand) {
		/* Update CreditRequest in last request */
		hdr->CreditRequest = cpu_to_le16(work->credits_granted);
	}
	ksmbd_debug(SMB,
		    "credits: requested[%d] granted[%d] total_granted[%d]\n",
		    credits_requested, credits_granted,
		    conn->total_credits);
	return 0;
}

/**
 * init_chained_smb2_rsp() - initialize smb2 chained response
 * @work:	smb work containing smb response buffer
 */
static void init_chained_smb2_rsp(struct ksmbd_work *work)
{
	struct smb2_hdr *req = ksmbd_req_buf_next(work);
	struct smb2_hdr *rsp = ksmbd_resp_buf_next(work);
	struct smb2_hdr *rsp_hdr;
	struct smb2_hdr *rcv_hdr;
	int next_hdr_offset = 0;
	int len, new_len;

	/* Len of this response = updated RFC len - offset of previous cmd
	 * in the compound rsp
	 */

	/* Storing the current local FID which may be needed by subsequent
	 * command in the compound request
	 */
	if (req->Command == SMB2_CREATE && rsp->Status == STATUS_SUCCESS) {
		work->compound_fid =
			le64_to_cpu(((struct smb2_create_rsp *)rsp)->
				VolatileFileId);
		work->compound_pfid =
			le64_to_cpu(((struct smb2_create_rsp *)rsp)->
				PersistentFileId);
		work->compound_sid = le64_to_cpu(rsp->SessionId);
	}

	len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
	next_hdr_offset = le32_to_cpu(req->NextCommand);

	new_len = ALIGN(len, 8);
	inc_rfc1001_len(work->response_buf,
			sizeof(struct smb2_hdr) + new_len - len);
	rsp->NextCommand = cpu_to_le32(new_len);

	work->next_smb2_rcv_hdr_off += next_hdr_offset;
	work->next_smb2_rsp_hdr_off += new_len;
	ksmbd_debug(SMB,
		    "Compound req new_len = %d rcv off = %d rsp off = %d\n",
		    new_len, work->next_smb2_rcv_hdr_off,
		    work->next_smb2_rsp_hdr_off);

	rsp_hdr = ksmbd_resp_buf_next(work);
	rcv_hdr = ksmbd_req_buf_next(work);

	if (!(rcv_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
		ksmbd_debug(SMB, "related flag should be set\n");
		work->compound_fid = KSMBD_NO_FID;
		work->compound_pfid = KSMBD_NO_FID;
	}
	memset((char *)rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
	rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
	rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
	rsp_hdr->Command = rcv_hdr->Command;

	/*
	 * Message is response. We don't grant oplock yet.
	 */
	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR |
				SMB2_FLAGS_RELATED_OPERATIONS);
	rsp_hdr->NextCommand = 0;
	rsp_hdr->MessageId = rcv_hdr->MessageId;
	rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
	rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
	rsp_hdr->SessionId = rcv_hdr->SessionId;
	memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
}

/**
 * is_chained_smb2_message() - check for chained command
 * @work:	smb work containing smb request buffer
 *
 * Return:      true if chained request, otherwise false
 */
bool is_chained_smb2_message(struct ksmbd_work *work)
{
	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
	unsigned int len, next_cmd;

	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
		return false;

	hdr = ksmbd_req_buf_next(work);
	next_cmd = le32_to_cpu(hdr->NextCommand);
	if (next_cmd > 0) {
		if ((u64)work->next_smb2_rcv_hdr_off + next_cmd +
			__SMB2_HEADER_STRUCTURE_SIZE >
		    get_rfc1002_len(work->request_buf)) {
			pr_err("next command(%u) offset exceeds smb msg size\n",
			       next_cmd);
			return false;
		}

		if ((u64)get_rfc1002_len(work->response_buf) + MAX_CIFS_SMALL_BUFFER_SIZE >
		    work->response_sz) {
			pr_err("next response offset exceeds response buffer size\n");
			return false;
		}

		ksmbd_debug(SMB, "got SMB2 chained command\n");
		init_chained_smb2_rsp(work);
		return true;
	} else if (work->next_smb2_rcv_hdr_off) {
		/*
		 * This is last request in chained command,
		 * align response to 8 byte
		 */
		len = ALIGN(get_rfc1002_len(work->response_buf), 8);
		len = len - get_rfc1002_len(work->response_buf);
		if (len) {
			ksmbd_debug(SMB, "padding len %u\n", len);
			inc_rfc1001_len(work->response_buf, len);
			if (work->aux_payload_sz)
				work->aux_payload_sz += len;
		}
	}
	return false;
}

/**
 * init_smb2_rsp_hdr() - initialize smb2 response
 * @work:	smb work containing smb request buffer
 *
 * Return:      0
 */
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 ksmbd_conn *conn = work->conn;

	memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
	*(__be32 *)work->response_buf =
		cpu_to_be32(conn->vals->header_size);
	rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
	rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
	rsp_hdr->Command = rcv_hdr->Command;

	/*
	 * Message is response. We don't grant oplock yet.
	 */
	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
	rsp_hdr->NextCommand = 0;
	rsp_hdr->MessageId = rcv_hdr->MessageId;
	rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
	rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
	rsp_hdr->SessionId = rcv_hdr->SessionId;
	memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);

	work->syncronous = true;
	if (work->async_id) {
		ksmbd_release_id(&conn->async_ida, work->async_id);
		work->async_id = 0;
	}

	return 0;
}

/**
 * smb2_allocate_rsp_buf() - allocate smb2 response buffer
 * @work:	smb work containing smb request buffer
 *
 * Return:      0 on success, otherwise -ENOMEM
 */
int smb2_allocate_rsp_buf(struct ksmbd_work *work)
{
	struct smb2_hdr *hdr = smb2_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;
	int cmd = le16_to_cpu(hdr->Command);

	if (cmd == SMB2_IOCTL_HE || cmd == SMB2_QUERY_DIRECTORY_HE)
		sz = large_sz;

	if (cmd == SMB2_QUERY_INFO_HE) {
		struct smb2_query_info_req *req;

		req = smb2_get_msg(work->request_buf);
		if (req->InfoType == SMB2_O_INFO_FILE &&
		    (req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
		     req->FileInfoClass == FILE_ALL_INFORMATION))
			sz = large_sz;
	}

	/* allocate large response buf for chained commands */
	if (le32_to_cpu(hdr->NextCommand) > 0)
		sz = large_sz;

	work->response_buf = kvmalloc(sz, GFP_KERNEL | __GFP_ZERO);
	if (!work->response_buf)
		return -ENOMEM;

	work->response_sz = sz;
	return 0;
}

/**
 * smb2_check_user_session() - check for valid session for a user
 * @work:	smb work containing smb request buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_check_user_session(struct ksmbd_work *work)
{
	struct smb2_hdr *req_hdr = smb2_get_msg(work->request_buf);
	struct ksmbd_conn *conn = work->conn;
	unsigned int cmd = conn->ops->get_cmd_val(work);
	unsigned long long sess_id;

	work->sess = NULL;
	/*
	 * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
	 * require a session id, so no need to validate user session's for
	 * these commands.
	 */
	if (cmd == SMB2_ECHO_HE || cmd == SMB2_NEGOTIATE_HE ||
	    cmd == SMB2_SESSION_SETUP_HE)
		return 0;

	if (!ksmbd_conn_good(work))
		return -EINVAL;

	sess_id = le64_to_cpu(req_hdr->SessionId);
	/* Check for validity of user session */
	work->sess = ksmbd_session_lookup_all(conn, sess_id);
	if (work->sess)
		return 1;
	ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
	return -EINVAL;
}

static void destroy_previous_session(struct ksmbd_user *user, u64 id)
{
	struct ksmbd_session *prev_sess = ksmbd_session_lookup_slowpath(id);
	struct ksmbd_user *prev_user;

	if (!prev_sess)
		return;

	prev_user = prev_sess->user;

	if (!prev_user ||
	    strcmp(user->name, prev_user->name) ||
	    user->passkey_sz != prev_user->passkey_sz ||
	    memcmp(user->passkey, prev_user->passkey, user->passkey_sz)) {
		put_session(prev_sess);
		return;
	}

	put_session(prev_sess);
	ksmbd_session_destroy(prev_sess);
}

/**
 * smb2_get_name() - get filename string from on the wire smb format
 * @share:	ksmbd_share_config pointer
 * @src:	source buffer
 * @maxlen:	maxlen of source string
 * @nls_table:	nls_table pointer
 *
 * Return:      matching converted filename on success, otherwise error ptr
 */
static char *
smb2_get_name(struct ksmbd_share_config *share, const char *src,
	      const int maxlen, struct nls_table *local_nls)
{
	char *name;

	name = smb_strndup_from_utf16(src, maxlen, 1, local_nls);
	if (IS_ERR(name)) {
		pr_err("failed to get name %ld\n", PTR_ERR(name));
		return name;
	}

	ksmbd_conv_path_to_unix(name);
	ksmbd_strip_last_slash(name);
	return name;
}

int setup_async_work(struct ksmbd_work *work, void (*fn)(void **), void **arg)
{
	struct smb2_hdr *rsp_hdr;
	struct ksmbd_conn *conn = work->conn;
	int id;

	rsp_hdr = smb2_get_msg(work->response_buf);
	rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;

	id = ksmbd_acquire_async_msg_id(&conn->async_ida);
	if (id < 0) {
		pr_err("Failed to alloc async message id\n");
		return id;
	}
	work->syncronous = false;
	work->async_id = id;
	rsp_hdr->Id.AsyncId = cpu_to_le64(id);

	ksmbd_debug(SMB,
		    "Send interim Response to inform async request id : %d\n",
		    work->async_id);

	work->cancel_fn = fn;
	work->cancel_argv = arg;

	if (list_empty(&work->async_request_entry)) {
		spin_lock(&conn->request_lock);
		list_add_tail(&work->async_request_entry, &conn->async_requests);
		spin_unlock(&conn->request_lock);
	}

	return 0;
}

void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
{
	struct smb2_hdr *rsp_hdr;

	rsp_hdr = smb2_get_msg(work->response_buf);
	smb2_set_err_rsp(work);
	rsp_hdr->Status = status;

	work->multiRsp = 1;
	ksmbd_conn_write(work);
	rsp_hdr->Status = 0;
	work->multiRsp = 0;
}

static __le32 smb2_get_reparse_tag_special_file(umode_t mode)
{
	if (S_ISDIR(mode) || S_ISREG(mode))
		return 0;

	if (S_ISLNK(mode))
		return IO_REPARSE_TAG_LX_SYMLINK_LE;
	else if (S_ISFIFO(mode))
		return IO_REPARSE_TAG_LX_FIFO_LE;
	else if (S_ISSOCK(mode))
		return IO_REPARSE_TAG_AF_UNIX_LE;
	else if (S_ISCHR(mode))
		return IO_REPARSE_TAG_LX_CHR_LE;
	else if (S_ISBLK(mode))
		return IO_REPARSE_TAG_LX_BLK_LE;

	return 0;
}

/**
 * smb2_get_dos_mode() - get file mode in dos format from unix mode
 * @stat:	kstat containing file mode
 * @attribute:	attribute flags
 *
 * Return:      converted dos mode
 */
static int smb2_get_dos_mode(struct kstat *stat, int attribute)
{
	int attr = 0;

	if (S_ISDIR(stat->mode)) {
		attr = FILE_ATTRIBUTE_DIRECTORY |
			(attribute & (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM));
	} else {
		attr = (attribute & 0x00005137) | FILE_ATTRIBUTE_ARCHIVE;
		attr &= ~(FILE_ATTRIBUTE_DIRECTORY);
		if (S_ISREG(stat->mode) && (server_conf.share_fake_fscaps &
				FILE_SUPPORTS_SPARSE_FILES))
			attr |= FILE_ATTRIBUTE_SPARSE_FILE;

		if (smb2_get_reparse_tag_special_file(stat->mode))
			attr |= FILE_ATTRIBUTE_REPARSE_POINT;
	}

	return attr;
}

static void build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt,
			       __le16 hash_id)
{
	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(38);
	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
	pneg_ctxt->Reserved = cpu_to_le32(0);
	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
	pneg_ctxt->HashAlgorithms = hash_id;
}

static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt,
			       __le16 cipher_type)
{
	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(4);
	pneg_ctxt->Reserved = cpu_to_le32(0);
	pneg_ctxt->CipherCount = cpu_to_le16(1);
	pneg_ctxt->Ciphers[0] = cipher_type;
}

static void build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt,
				   __le16 comp_algo)
{
	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->Reserved = cpu_to_le32(0);
	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(1);
	pneg_ctxt->Flags = cpu_to_le32(0);
	pneg_ctxt->CompressionAlgorithms[0] = comp_algo;
}

static void build_sign_cap_ctxt(struct smb2_signing_capabilities *pneg_ctxt,
				__le16 sign_algo)
{
	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
	pneg_ctxt->DataLength =
		cpu_to_le16((sizeof(struct smb2_signing_capabilities) + 2)
			- sizeof(struct smb2_neg_context));
	pneg_ctxt->Reserved = cpu_to_le32(0);
	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(1);
	pneg_ctxt->SigningAlgorithms[0] = sign_algo;
}

static void build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
	pneg_ctxt->Name[0] = 0x93;
	pneg_ctxt->Name[1] = 0xAD;
	pneg_ctxt->Name[2] = 0x25;
	pneg_ctxt->Name[3] = 0x50;
	pneg_ctxt->Name[4] = 0x9C;
	pneg_ctxt->Name[5] = 0xB4;
	pneg_ctxt->Name[6] = 0x11;
	pneg_ctxt->Name[7] = 0xE7;
	pneg_ctxt->Name[8] = 0xB4;
	pneg_ctxt->Name[9] = 0x23;
	pneg_ctxt->Name[10] = 0x83;
	pneg_ctxt->Name[11] = 0xDE;
	pneg_ctxt->Name[12] = 0x96;
	pneg_ctxt->Name[13] = 0x8B;
	pneg_ctxt->Name[14] = 0xCD;
	pneg_ctxt->Name[15] = 0x7C;
}

static void assemble_neg_contexts(struct ksmbd_conn *conn,
				  struct smb2_negotiate_rsp *rsp,
				  void *smb2_buf_len)
{
	char *pneg_ctxt = (char *)rsp +
			le32_to_cpu(rsp->NegotiateContextOffset);
	int neg_ctxt_cnt = 1;
	int ctxt_size;

	ksmbd_debug(SMB,
		    "assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
			   conn->preauth_info->Preauth_HashId);
	rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
	inc_rfc1001_len(smb2_buf_len, AUTH_GSS_PADDING);
	ctxt_size = sizeof(struct smb2_preauth_neg_context);
	/* Round to 8 byte boundary */
	pneg_ctxt += round_up(sizeof(struct smb2_preauth_neg_context), 8);

	if (conn->cipher_type) {
		ctxt_size = round_up(ctxt_size, 8);
		ksmbd_debug(SMB,
			    "assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
		build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt,
				   conn->cipher_type);
		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
		ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2;
		/* Round to 8 byte boundary */
		pneg_ctxt +=
			round_up(sizeof(struct smb2_encryption_neg_context) + 2,
				 8);
	}

	if (conn->compress_algorithm) {
		ctxt_size = round_up(ctxt_size, 8);
		ksmbd_debug(SMB,
			    "assemble SMB2_COMPRESSION_CAPABILITIES context\n");
		/* Temporarily set to SMB3_COMPRESS_NONE */
		build_compression_ctxt((struct smb2_compression_capabilities_context *)pneg_ctxt,
				       conn->compress_algorithm);
		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
		ctxt_size += sizeof(struct smb2_compression_capabilities_context) + 2;
		/* Round to 8 byte boundary */
		pneg_ctxt += round_up(sizeof(struct smb2_compression_capabilities_context) + 2,
				      8);
	}

	if (conn->posix_ext_supported) {
		ctxt_size = round_up(ctxt_size, 8);
		ksmbd_debug(SMB,
			    "assemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
		build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
		ctxt_size += sizeof(struct smb2_posix_neg_context);
		/* Round to 8 byte boundary */
		pneg_ctxt += round_up(sizeof(struct smb2_posix_neg_context), 8);
	}

	if (conn->signing_negotiated) {
		ctxt_size = round_up(ctxt_size, 8);
		ksmbd_debug(SMB,
			    "assemble SMB2_SIGNING_CAPABILITIES context\n");
		build_sign_cap_ctxt((struct smb2_signing_capabilities *)pneg_ctxt,
				    conn->signing_algorithm);
		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
		ctxt_size += sizeof(struct smb2_signing_capabilities) + 2;
	}

	inc_rfc1001_len(smb2_buf_len, ctxt_size);
}

static __le32 decode_preauth_ctxt(struct ksmbd_conn *conn,
				  struct smb2_preauth_neg_context *pneg_ctxt)
{
	__le32 err = STATUS_NO_PREAUTH_INTEGRITY_HASH_OVERLAP;

	if (pneg_ctxt->HashAlgorithms == SMB2_PREAUTH_INTEGRITY_SHA512) {
		conn->preauth_info->Preauth_HashId =
			SMB2_PREAUTH_INTEGRITY_SHA512;
		err = STATUS_SUCCESS;
	}

	return err;
}

static void decode_encrypt_ctxt(struct ksmbd_conn *conn,
				struct smb2_encryption_neg_context *pneg_ctxt,
				int len_of_ctxts)
{
	int cph_cnt = le16_to_cpu(pneg_ctxt->CipherCount);
	int i, cphs_size = cph_cnt * sizeof(__le16);

	conn->cipher_type = 0;

	if (sizeof(struct smb2_encryption_neg_context) + cphs_size >
	    len_of_ctxts) {
		pr_err("Invalid cipher count(%d)\n", cph_cnt);
		return;
	}

	if (!(server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION))
		return;

	for (i = 0; i < cph_cnt; i++) {
		if (pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_GCM ||
		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_CCM ||
		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_CCM ||
		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_GCM) {
			ksmbd_debug(SMB, "Cipher ID = 0x%x\n",
				    pneg_ctxt->Ciphers[i]);
			conn->cipher_type = pneg_ctxt->Ciphers[i];
			break;
		}
	}
}

static void decode_compress_ctxt(struct ksmbd_conn *conn,
				 struct smb2_compression_capabilities_context *pneg_ctxt)
{
	conn->compress_algorithm = SMB3_COMPRESS_NONE;
}

static void decode_sign_cap_ctxt(struct ksmbd_conn *conn,
				 struct smb2_signing_capabilities *pneg_ctxt,
				 int len_of_ctxts)
{
	int sign_algo_cnt = le16_to_cpu(pneg_ctxt->SigningAlgorithmCount);
	int i, sign_alos_size = sign_algo_cnt * sizeof(__le16);

	conn->signing_negotiated = false;

	if (sizeof(struct smb2_signing_capabilities) + sign_alos_size >
	    len_of_ctxts) {
		pr_err("Invalid signing algorithm count(%d)\n", sign_algo_cnt);
		return;
	}

	for (i = 0; i < sign_algo_cnt; i++) {
		if (pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_HMAC_SHA256_LE ||
		    pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_AES_CMAC_LE) {
			ksmbd_debug(SMB, "Signing Algorithm ID = 0x%x\n",
				    pneg_ctxt->SigningAlgorithms[i]);
			conn->signing_negotiated = true;
			conn->signing_algorithm =
				pneg_ctxt->SigningAlgorithms[i];
			break;
		}
	}
}

static __le32 deassemble_neg_contexts(struct ksmbd_conn *conn,
				      struct smb2_negotiate_req *req,
				      int len_of_smb)
{
	/* +4 is to account for the RFC1001 len field */
	struct smb2_neg_context *pctx = (struct smb2_neg_context *)req;
	int i = 0, len_of_ctxts;
	int offset = le32_to_cpu(req->NegotiateContextOffset);
	int neg_ctxt_cnt = le16_to_cpu(req->NegotiateContextCount);
	__le32 status = STATUS_INVALID_PARAMETER;

	ksmbd_debug(SMB, "decoding %d negotiate contexts\n", neg_ctxt_cnt);
	if (len_of_smb <= offset) {
		ksmbd_debug(SMB, "Invalid response: negotiate context offset\n");
		return status;
	}

	len_of_ctxts = len_of_smb - offset;

	while (i++ < neg_ctxt_cnt) {
		int clen;

		/* check that offset is not beyond end of SMB */
		if (len_of_ctxts == 0)
			break;

		if (len_of_ctxts < sizeof(struct smb2_neg_context))
			break;

		pctx = (struct smb2_neg_context *)((char *)pctx + offset);
		clen = le16_to_cpu(pctx->DataLength);
		if (clen + sizeof(struct smb2_neg_context) > len_of_ctxts)
			break;

		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
			if (conn->preauth_info->Preauth_HashId)
				break;

			status = decode_preauth_ctxt(conn,
						     (struct smb2_preauth_neg_context *)pctx);
			if (status != STATUS_SUCCESS)
				break;
		} else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_ENCRYPTION_CAPABILITIES context\n");
			if (conn->cipher_type)
				break;

			decode_encrypt_ctxt(conn,
					    (struct smb2_encryption_neg_context *)pctx,
					    len_of_ctxts);
		} else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_COMPRESSION_CAPABILITIES context\n");
			if (conn->compress_algorithm)
				break;

			decode_compress_ctxt(conn,
					     (struct smb2_compression_capabilities_context *)pctx);
		} else if (pctx->ContextType == SMB2_NETNAME_NEGOTIATE_CONTEXT_ID) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_NETNAME_NEGOTIATE_CONTEXT_ID context\n");
		} else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
			conn->posix_ext_supported = true;
		} else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES) {
			ksmbd_debug(SMB,
				    "deassemble SMB2_SIGNING_CAPABILITIES context\n");
			decode_sign_cap_ctxt(conn,
					     (struct smb2_signing_capabilities *)pctx,
					     len_of_ctxts);
		}

		/* offsets must be 8 byte aligned */
		clen = (clen + 7) & ~0x7;
		offset = clen + sizeof(struct smb2_neg_context);
		len_of_ctxts -= clen + sizeof(struct smb2_neg_context);
	}
	return status;
}

/**
 * smb2_handle_negotiate() - handler for smb2 negotiate command
 * @work:	smb work containing smb request buffer
 *
 * Return:      0
 */
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);
	int rc = 0;
	unsigned int smb2_buf_len, smb2_neg_size;
	__le32 status;

	ksmbd_debug(SMB, "Received negotiate request\n");
	conn->need_neg = false;
	if (ksmbd_conn_good(work)) {
		pr_err("conn->tcp_status is already in CifsGood State\n");
		work->send_no_response = 1;
		return rc;
	}

	if (req->DialectCount == 0) {
		pr_err("malformed packet\n");
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
		rc = -EINVAL;
		goto err_out;
	}

	smb2_buf_len = get_rfc1002_len(work->request_buf);
	smb2_neg_size = offsetof(struct smb2_negotiate_req, Dialects);
	if (smb2_neg_size > smb2_buf_len) {
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
		rc = -EINVAL;
		goto err_out;
	}

	if (conn->dialect == SMB311_PROT_ID) {
		unsigned int nego_ctxt_off = le32_to_cpu(req->NegotiateContextOffset);

		if (smb2_buf_len < nego_ctxt_off) {
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			rc = -EINVAL;
			goto err_out;
		}

		if (smb2_neg_size > nego_ctxt_off) {
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			rc = -EINVAL;
			goto err_out;
		}

		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
		    nego_ctxt_off) {
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			rc = -EINVAL;
			goto err_out;
		}
	} else {
		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
		    smb2_buf_len) {
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			rc = -EINVAL;
			goto err_out;
		}
	}

	conn->cli_cap = le32_to_cpu(req->Capabilities);
	switch (conn->dialect) {
	case SMB311_PROT_ID:
		conn->preauth_info =
			kzalloc(sizeof(struct preauth_integrity_info),
				GFP_KERNEL);
		if (!conn->preauth_info) {
			rc = -ENOMEM;
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			goto err_out;
		}

		status = deassemble_neg_contexts(conn, req,
						 get_rfc1002_len(work->request_buf));
		if (status != STATUS_SUCCESS) {
			pr_err("deassemble_neg_contexts error(0x%x)\n",
			       status);
			rsp->hdr.Status = status;
			rc = -EINVAL;
			goto err_out;
		}

		rc = init_smb3_11_server(conn);
		if (rc < 0) {
			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
			goto err_out;
		}

		ksmbd_gen_preauth_integrity_hash(conn,
						 work->request_buf,
						 conn->preauth_info->Preauth_HashValue);
		rsp->NegotiateContextOffset =
				cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
		assemble_neg_contexts(conn, rsp, work->response_buf);
		break;
	case SMB302_PROT_ID:
		init_smb3_02_server(conn);
		break;
	case SMB30_PROT_ID:
		init_smb3_0_server(conn);
		break;
	case SMB21_PROT_ID:
		init_smb2_1_server(conn);
		break;
	case SMB2X_PROT_ID:
	case BAD_PROT_ID:
	default:
		ksmbd_debug(SMB, "Server dialect :0x%x not supported\n",
			    conn->dialect);
		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
		rc = -EINVAL;
		goto err_out;
	}
	rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);

	/* For stats */
	conn->connection_type = conn->dialect;

	rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
	rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
	rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);

	memcpy(conn->ClientGUID, req->ClientGUID,
			SMB2_CLIENT_GUID_SIZE);
	conn->cli_sec_mode = le16_to_cpu(req->SecurityMode);

	rsp->StructureSize = cpu_to_le16(65);
	rsp->DialectRevision = cpu_to_le16(conn->dialect);
	/* Not setting conn guid rsp->ServerGUID, as it
	 * not used by client for identifying server
	 */
	memset(rsp->ServerGUID, 0, SMB2_CLIENT_GUID_SIZE);

	rsp->SystemTime = cpu_to_le64(ksmbd_systime());
	rsp->ServerStartTime = 0;
	ksmbd_debug(SMB, "negotiate context offset %d, count %d\n",
		    le32_to_cpu(rsp->NegotiateContextOffset),
		    le16_to_cpu(rsp->NegotiateContextCount));

	rsp->SecurityBufferOffset = cpu_to_le16(128);
	rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
	ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
				  le16_to_cpu(rsp->SecurityBufferOffset));
	inc_rfc1001_len(work->response_buf, sizeof(struct smb2_negotiate_rsp) -
			sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
			 AUTH_GSS_LENGTH);
	rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
	conn->use_spnego = true;

	if ((server_conf.signing == KSMBD_CONFIG_OPT_AUTO ||
	     server_conf.signing == KSMBD_CONFIG_OPT_DISABLED) &&
	    req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED_LE)
		conn->sign = true;
	else if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY) {
		server_conf.enforced_signing = true;
		rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
		conn->sign = true;
	}

	conn->srv_sec_mode = le16_to_cpu(rsp->SecurityMode);
	ksmbd_conn_set_need_negotiate(work);

err_out:
	if (rc < 0)
		smb2_set_err_rsp(work);

	return rc;
}

static int alloc_preauth_hash(struct ksmbd_session *sess,
			      struct ksmbd_conn *conn)
{
	if (sess->Preauth_HashValue)
		return 0;

	sess->Preauth_HashValue = kmemdup(conn->preauth_info->Preauth_HashValue,
					  PREAUTH_HASHVALUE_SIZE, GFP_KERNEL);
	if (!sess->Preauth_HashValue)
		return -ENOMEM;

	return 0;
}

static int generate_preauth_hash(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct ksmbd_session *sess = work->sess;
	u8 *preauth_hash;

	if (conn->dialect != SMB311_PROT_ID)
		return 0;

	if (conn->binding) {
		struct preauth_session *preauth_sess;

		preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
		if (!preauth_sess) {
			preauth_sess = ksmbd_preauth_session_alloc(conn, sess->id);
			if (!preauth_sess)
				return -ENOMEM;
		}

		preauth_hash = preauth_sess->Preauth_HashValue;
	} else {
		if (!sess->Preauth_HashValue)
			if (alloc_preauth_hash(sess, conn))
				return -ENOMEM;
		preauth_hash = sess->Preauth_HashValue;
	}

	ksmbd_gen_preauth_integrity_hash(conn, work->request_buf, preauth_hash);
	return 0;
}

static int decode_negotiation_token(struct ksmbd_conn *conn,
				    struct negotiate_message *negblob,
				    size_t sz)
{
	if (!conn->use_spnego)
		return -EINVAL;

	if (ksmbd_decode_negTokenInit((char *)negblob, sz, conn)) {
		if (ksmbd_decode_negTokenTarg((char *)negblob, sz, conn)) {
			conn->auth_mechs |= KSMBD_AUTH_NTLMSSP;
			conn->preferred_auth_mech = KSMBD_AUTH_NTLMSSP;
			conn->use_spnego = false;
		}
	}
	return 0;
}

static int ntlm_negotiate(struct ksmbd_work *work,
			  struct negotiate_message *negblob,
			  size_t negblob_len)
{
	struct smb2_sess_setup_rsp *rsp = smb2_get_msg(work->response_buf);
	struct challenge_message *chgblob;
	unsigned char *spnego_blob = NULL;
	u16 spnego_blob_len;
	char *neg_blob;
	int sz, rc;

	ksmbd_debug(SMB, "negotiate phase\n");
	rc = ksmbd_decode_ntlmssp_neg_blob(negblob, negblob_len, work->sess);
	if (rc)
		return rc;

	sz = le16_to_cpu(rsp->SecurityBufferOffset);
	chgblob =
		(struct challenge_message *)((char *)&rsp->hdr.ProtocolId + sz);
	memset(chgblob, 0, sizeof(struct challenge_message));

	if (!work->conn->use_spnego) {
		sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->sess);
		if (sz < 0)
			return -ENOMEM;

		rsp->SecurityBufferLength = cpu_to_le16(sz);
		return 0;
	}

	sz = sizeof(struct challenge_message);
	sz += (strlen(ksmbd_netbios_name()) * 2 + 1 + 4) * 6;

	neg_blob = kzalloc(sz, GFP_KERNEL);
	if (!neg_blob)
		return -ENOMEM;

	chgblob = (struct challenge_message *)neg_blob;
	sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->sess);
	if (sz < 0) {
		rc = -ENOMEM;
		goto out;
	}

	rc = build_spnego_ntlmssp_neg_blob(&spnego_blob, &spnego_blob_len,
					   neg_blob, sz);
	if (rc) {
		rc = -ENOMEM;
		goto out;
	}

	sz = le16_to_cpu(rsp->SecurityBufferOffset);
	memcpy((char *)&rsp->hdr.ProtocolId + sz, spnego_blob, spnego_blob_len);
	rsp->SecurityBufferLength = cpu_to_le16(spnego_blob_len);

out:
	kfree(spnego_blob);
	kfree(neg_blob);
	return rc;
}

static struct authenticate_message *user_authblob(struct ksmbd_conn *conn,
						  struct smb2_sess_setup_req *req)
{
	int sz;

	if (conn->use_spnego && conn->mechToken)
		return (struct authenticate_message *)conn->mechToken;

	sz = le16_to_cpu(req->SecurityBufferOffset);
	return (struct authenticate_message *)((char *)&req->hdr.ProtocolId
					       + sz);
}

static struct ksmbd_user *session_user(struct ksmbd_conn *conn,
				       struct smb2_sess_setup_req *req)
{
	struct authenticate_message *authblob;
	struct ksmbd_user *user;
	char *name;
	unsigned int auth_msg_len, name_off, name_len, secbuf_len;

	secbuf_len = le16_to_cpu(req->SecurityBufferLength);
	if (secbuf_len < sizeof(struct authenticate_message)) {
		ksmbd_debug(SMB, "blob len %d too small\n", secbuf_len);
		return NULL;
	}
	authblob = user_authblob(conn, req);
	name_off = le32_to_cpu(authblob->UserName.BufferOffset);
	name_len = le16_to_cpu(authblob->UserName.Length);
	auth_msg_len = le16_to_cpu(req->SecurityBufferOffset) + secbuf_len;

	if (auth_msg_len < (u64)name_off + name_len)
		return NULL;

	name = smb_strndup_from_utf16((const char *)authblob + name_off,
				      name_len,
				      true,
				      conn->local_nls);
	if (IS_ERR(name)) {
		pr_err("cannot allocate memory\n");
		return NULL;
	}

	ksmbd_debug(SMB, "session setup request for user %s\n", name);
	user = ksmbd_login_user(name);
	kfree(name);
	return user;
}

static int ntlm_authenticate(struct ksmbd_work *work)
{
	struct smb2_sess_setup_req *req = smb2_get_msg(work->request_buf);
	struct smb2_sess_setup_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_conn *conn = work->conn;
	struct ksmbd_session *sess = work->sess;
	struct channel *chann = NULL;
	struct ksmbd_user *user;
	u64 prev_id;
	int sz, rc;

	ksmbd_debug(SMB, "authenticate phase\n");
	if (conn->use_spnego) {
		unsigned char *spnego_blob;
		u16 spnego_blob_len;

		rc = build_spnego_ntlmssp_auth_blob(&spnego_blob,
						    &spnego_blob_len,
						    0);
		if (rc)
			return -ENOMEM;

		sz = le16_to_cpu(rsp->SecurityBufferOffset);
		memcpy((char *)&rsp->hdr.ProtocolId + sz, spnego_blob, spnego_blob_len);
		rsp->SecurityBufferLength = cpu_to_le16(spnego_blob_len);
		kfree(spnego_blob);
		inc_rfc1001_len(work->response_buf, spnego_blob_len - 1);
	}

	user = session_user(conn, req);
	if (!user) {
		ksmbd_debug(SMB, "Unknown user name or an error\n");
		return -EPERM;
	}

	/* Check for previous session */
	prev_id = le64_to_cpu(req->PreviousSessionId);
	if (prev_id && prev_id != sess->id)
		destroy_previous_session(user, prev_id);

	if (sess->state == SMB2_SESSION_VALID) {
		/*
		 * Reuse session if anonymous try to connect
		 * on reauthetication.
		 */
		if (ksmbd_anonymous_user(user)) {
			ksmbd_free_user(user);
			return 0;
		}
		ksmbd_free_user(sess->user);
	}

	sess->user = user;
	if (user_guest(sess->user)) {
		if (conn->sign) {
			ksmbd_debug(SMB, "Guest login not allowed when signing enabled\n");
			return -EPERM;
		}

		rsp->SessionFlags = SMB2_SESSION_FLAG_IS_GUEST_LE;
	} else {
		struct authenticate_message *authblob;

		authblob = user_authblob(conn, req);
		sz = le16_to_cpu(req->SecurityBufferLength);
		rc = ksmbd_decode_ntlmssp_auth_blob(authblob, sz, sess);
		if (rc) {
			set_user_flag(sess->user, KSMBD_USER_FLAG_BAD_PASSWORD);
			ksmbd_debug(SMB, "authentication failed\n");
			return -EPERM;
		}

		/*
		 * If session state is SMB2_SESSION_VALID, We can assume
		 * that it is reauthentication. And the user/password
		 * has been verified, so return it here.
		 */
		if (sess->state == SMB2_SESSION_VALID) {
			if (conn->binding)
				goto binding_session;
			return 0;
		}

		if ((conn->sign || server_conf.enforced_signing) ||
		    (req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
			sess->sign = true;

		if (conn->vals->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION &&
		    conn->ops->generate_encryptionkey &&
		    !(req->Flags & SMB2_SESSION_REQ_FLAG_BINDING)) {
			rc = conn->ops->generate_encryptionkey(sess);
			if (rc) {
				ksmbd_debug(SMB,
					    "SMB3 encryption key generation failed\n");
				return -EINVAL;
			}
			sess->enc = true;
			rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
			/*
			 * signing is disable if encryption is enable
			 * on this session
			 */
			sess->sign = false;
		}
	}

binding_session:
	if (conn->dialect >= SMB30_PROT_ID) {
		chann = lookup_chann_list(sess, conn);
		if (!chann) {
			chann = kmalloc(sizeof(struct channel), GFP_KERNEL);
			if (!chann)
				return -ENOMEM;

			chann->conn = conn;
			INIT_LIST_HEAD(&chann->chann_list);
			list_add(&chann->chann_list, &sess->ksmbd_chann_list);
		}
	}

	if (conn->ops->generate_signingkey) {
		rc = conn->ops->generate_signingkey(sess, conn);
		if (rc) {
			ksmbd_debug(SMB, "SMB3 signing key generation failed\n");
			return -EINVAL;
		}
	}

	if (!ksmbd_conn_lookup_dialect(conn)) {
		pr_err("fail to verify the dialect\n");
		return -ENOENT;
	}
	return 0;
}

#ifdef CONFIG_SMB_SERVER_KERBEROS5
static int krb5_authenticate(struct ksmbd_work *work)
{
	struct smb2_sess_setup_req *req = smb2_get_msg(work->request_buf);
	struct smb2_sess_setup_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_conn *conn = work->conn;
	struct ksmbd_session *sess = work->sess;
	char *in_blob, *out_blob;
	struct channel *chann = NULL;
	u64 prev_sess_id;
	int in_len, out_len;
	int retval;

	in_blob = (char *)&req->hdr.ProtocolId +
		le16_to_cpu(req->SecurityBufferOffset);
	in_len = le16_to_cpu(req->SecurityBufferLength);
	out_blob = (char *)&rsp->hdr.ProtocolId +
		le16_to_cpu(rsp->SecurityBufferOffset);
	out_len = work->response_sz -
		(le16_to_cpu(rsp->SecurityBufferOffset) + 4);

	/* Check previous session */
	prev_sess_id = le64_to_cpu(req->PreviousSessionId);
	if (prev_sess_id && prev_sess_id != sess->id)
		destroy_previous_session(sess->user, prev_sess_id);

	if (sess->state == SMB2_SESSION_VALID)
		ksmbd_free_user(sess->user);

	retval = ksmbd_krb5_authenticate(sess, in_blob, in_len,
					 out_blob, &out_len);
	if (retval) {
		ksmbd_debug(SMB, "krb5 authentication failed\n");
		return -EINVAL;
	}
	rsp->SecurityBufferLength = cpu_to_le16(out_len);
	inc_rfc1001_len(work->response_buf, out_len - 1);

	if ((conn->sign || server_conf.enforced_signing) ||
	    (req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
		sess->sign = true;

	if ((conn->vals->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) &&
	    conn->ops->generate_encryptionkey) {
		retval = conn->ops->generate_encryptionkey(sess);
		if (retval) {
			ksmbd_debug(SMB,
				    "SMB3 encryption key generation failed\n");
			return -EINVAL;
		}
		sess->enc = true;
		rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
		sess->sign = false;
	}

	if (conn->dialect >= SMB30_PROT_ID) {
		chann = lookup_chann_list(sess, conn);
		if (!chann) {
			chann = kmalloc(sizeof(struct channel), GFP_KERNEL);
			if (!chann)
				return -ENOMEM;

			chann->conn = conn;
			INIT_LIST_HEAD(&chann->chann_list);
			list_add(&chann->chann_list, &sess->ksmbd_chann_list);
		}
	}

	if (conn->ops->generate_signingkey) {
		retval = conn->ops->generate_signingkey(sess, conn);
		if (retval) {
			ksmbd_debug(SMB, "SMB3 signing key generation failed\n");
			return -EINVAL;
		}
	}

	if (!ksmbd_conn_lookup_dialect(conn)) {
		pr_err("fail to verify the dialect\n");
		return -ENOENT;
	}
	return 0;
}
#else
static int krb5_authenticate(struct ksmbd_work *work)
{
	return -EOPNOTSUPP;
}
#endif

int smb2_sess_setup(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct smb2_sess_setup_req *req = smb2_get_msg(work->request_buf);
	struct smb2_sess_setup_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_session *sess;
	struct negotiate_message *negblob;
	unsigned int negblob_len, negblob_off;
	int rc = 0;

	ksmbd_debug(SMB, "Received request for session setup\n");

	rsp->StructureSize = cpu_to_le16(9);
	rsp->SessionFlags = 0;
	rsp->SecurityBufferOffset = cpu_to_le16(72);
	rsp->SecurityBufferLength = 0;
	inc_rfc1001_len(work->response_buf, 9);

	if (!req->hdr.SessionId) {
		sess = ksmbd_smb2_session_create();
		if (!sess) {
			rc = -ENOMEM;
			goto out_err;
		}
		rsp->hdr.SessionId = cpu_to_le64(sess->id);
		ksmbd_session_register(conn, sess);
	} else if (conn->dialect >= SMB30_PROT_ID &&
		   (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) &&
		   req->Flags & SMB2_SESSION_REQ_FLAG_BINDING) {
		u64 sess_id = le64_to_cpu(req->hdr.SessionId);

		sess = ksmbd_session_lookup_slowpath(sess_id);
		if (!sess) {
			rc = -ENOENT;
			goto out_err;
		}

		if (conn->dialect != sess->conn->dialect) {
			rc = -EINVAL;
			goto out_err;
		}

		if (!(req->hdr.Flags & SMB2_FLAGS_SIGNED)) {
			rc = -EINVAL;
			goto out_err;
		}

		if (strncmp(conn->ClientGUID, sess->conn->ClientGUID,
			    SMB2_CLIENT_GUID_SIZE)) {
			rc = -ENOENT;
			goto out_err;
		}

		if (sess->state == SMB2_SESSION_IN_PROGRESS) {
			rc = -EACCES;
			goto out_err;
		}

		if (sess->state == SMB2_SESSION_EXPIRED) {
			rc = -EFAULT;
			goto out_err;
		}

		if (ksmbd_session_lookup(conn, sess_id)) {
			rc = -EACCES;
			goto out_err;
		}

		conn->binding = true;
	} else if ((conn->dialect < SMB30_PROT_ID ||
		    server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) &&
		   (req->Flags & SMB2_SESSION_REQ_FLAG_BINDING)) {
		sess = NULL;
		rc = -EACCES;
		goto out_err;
	} else {
		sess = ksmbd_session_lookup(conn,
					    le64_to_cpu(req->hdr.SessionId));
		if (!sess) {
			rc = -ENOENT;
			goto out_err;
		}
	}
	work->sess = sess;

	if (sess->state == SMB2_SESSION_EXPIRED)
		sess->state = SMB2_SESSION_IN_PROGRESS;

	negblob_off = le16_to_cpu(req->SecurityBufferOffset);
	negblob_len = le16_to_cpu(req->SecurityBufferLength);
	if (negblob_off < offsetof(struct smb2_sess_setup_req, Buffer) ||
	    negblob_len < offsetof(struct negotiate_message, NegotiateFlags)) {
		rc = -EINVAL;
		goto out_err;
	}

	negblob = (struct negotiate_message *)((char *)&req->hdr.ProtocolId +
			negblob_off);

	if (decode_negotiation_token(conn, negblob, negblob_len) == 0) {
		if (conn->mechToken)
			negblob = (struct negotiate_message *)conn->mechToken;
	}

	if (server_conf.auth_mechs & conn->auth_mechs) {
		rc = generate_preauth_hash(work);
		if (rc)
			goto out_err;

		if (conn->preferred_auth_mech &
				(KSMBD_AUTH_KRB5 | KSMBD_AUTH_MSKRB5)) {
			rc = krb5_authenticate(work);
			if (rc) {
				rc = -EINVAL;
				goto out_err;
			}

			ksmbd_conn_set_good(work);
			sess->state = SMB2_SESSION_VALID;
			kfree(sess->Preauth_HashValue);
			sess->Preauth_HashValue = NULL;
		} else if (conn->preferred_auth_mech == KSMBD_AUTH_NTLMSSP) {
			if (negblob->MessageType == NtLmNegotiate) {
				rc = ntlm_negotiate(work, negblob, negblob_len);
				if (rc)
					goto out_err;
				rsp->hdr.Status =
					STATUS_MORE_PROCESSING_REQUIRED;
				/*
				 * Note: here total size -1 is done as an
				 * adjustment for 0 size blob
				 */
				inc_rfc1001_len(work->response_buf,
						le16_to_cpu(rsp->SecurityBufferLength) - 1);

			} else if (negblob->MessageType == NtLmAuthenticate) {
				rc = ntlm_authenticate(work);
				if (rc)
					goto out_err;

				ksmbd_conn_set_good(work);
				sess->state = SMB2_SESSION_VALID;
				if (conn->binding) {
					struct preauth_session *preauth_sess;

					preauth_sess =
						ksmbd_preauth_session_lookup(conn, sess->id);
					if (preauth_sess) {
						list_del(&preauth_sess->preauth_entry);
						kfree(preauth_sess);
					}
				}
				kfree(sess->Preauth_HashValue);
				sess->Preauth_HashValue = NULL;
			}
		} else {
			/* TODO: need one more negotiation */
			pr_err("Not support the preferred authentication\n");
			rc = -EINVAL;
		}
	} else {
		pr_err("Not support authentication\n");
		rc = -EINVAL;
	}

out_err:
	if (rc == -EINVAL)
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
	else if (rc == -ENOENT)
		rsp->hdr.Status = STATUS_USER_SESSION_DELETED;
	else if (rc == -EACCES)
		rsp->hdr.Status = STATUS_REQUEST_NOT_ACCEPTED;
	else if (rc == -EFAULT)
		rsp->hdr.Status = STATUS_NETWORK_SESSION_EXPIRED;
	else if (rc == -ENOMEM)
		rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
	else if (rc)
		rsp->hdr.Status = STATUS_LOGON_FAILURE;

	if (conn->use_spnego && conn->mechToken) {
		kfree(conn->mechToken);
		conn->mechToken = NULL;
	}

	if (rc < 0) {
		/*
		 * SecurityBufferOffset should be set to zero
		 * in session setup error response.
		 */
		rsp->SecurityBufferOffset = 0;

		if (sess) {
			bool try_delay = false;

			/*
			 * To avoid dictionary attacks (repeated session setups rapidly sent) to
			 * connect to server, ksmbd make a delay of a 5 seconds on session setup
			 * failure to make it harder to send enough random connection requests
			 * to break into a server.
			 */
			if (sess->user && sess->user->flags & KSMBD_USER_FLAG_DELAY_SESSION)
				try_delay = true;

			ksmbd_session_destroy(sess);
			work->sess = NULL;
			if (try_delay)
				ssleep(5);
		}
	}

	return rc;
}

/**
 * smb2_tree_connect() - handler for smb2 tree connect command
 * @work:	smb work containing smb request buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_tree_connect(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct smb2_tree_connect_req *req = smb2_get_msg(work->request_buf);
	struct smb2_tree_connect_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_session *sess = work->sess;
	char *treename = NULL, *name = NULL;
	struct ksmbd_tree_conn_status status;
	struct ksmbd_share_config *share;
	int rc = -EINVAL;

	treename = smb_strndup_from_utf16(req->Buffer,
					  le16_to_cpu(req->PathLength), true,
					  conn->local_nls);
	if (IS_ERR(treename)) {
		pr_err("treename is NULL\n");
		status.ret = KSMBD_TREE_CONN_STATUS_ERROR;
		goto out_err1;
	}

	name = ksmbd_extract_sharename(treename);
	if (IS_ERR(name)) {
		status.ret = KSMBD_TREE_CONN_STATUS_ERROR;
		goto out_err1;
	}

	ksmbd_debug(SMB, "tree connect request for tree %s treename %s\n",
		    name, treename);

	status = ksmbd_tree_conn_connect(sess, name);
	if (status.ret == KSMBD_TREE_CONN_STATUS_OK)
		rsp->hdr.Id.SyncId.TreeId = cpu_to_le32(status.tree_conn->id);
	else
		goto out_err1;

	share = status.tree_conn->share_conf;
	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) {
		ksmbd_debug(SMB, "IPC share path request\n");
		rsp->ShareType = SMB2_SHARE_TYPE_PIPE;
		rsp->MaximalAccess = FILE_READ_DATA_LE | FILE_READ_EA_LE |
			FILE_EXECUTE_LE | FILE_READ_ATTRIBUTES_LE |
			FILE_DELETE_LE | FILE_READ_CONTROL_LE |
			FILE_WRITE_DAC_LE | FILE_WRITE_OWNER_LE |
			FILE_SYNCHRONIZE_LE;
	} else {
		rsp->ShareType = SMB2_SHARE_TYPE_DISK;
		rsp->MaximalAccess = FILE_READ_DATA_LE | FILE_READ_EA_LE |
			FILE_EXECUTE_LE | FILE_READ_ATTRIBUTES_LE;
		if (test_tree_conn_flag(status.tree_conn,
					KSMBD_TREE_CONN_FLAG_WRITABLE)) {
			rsp->MaximalAccess |= FILE_WRITE_DATA_LE |
				FILE_APPEND_DATA_LE | FILE_WRITE_EA_LE |
				FILE_DELETE_LE | FILE_WRITE_ATTRIBUTES_LE |
				FILE_DELETE_CHILD_LE | FILE_READ_CONTROL_LE |
				FILE_WRITE_DAC_LE | FILE_WRITE_OWNER_LE |
				FILE_SYNCHRONIZE_LE;
		}
	}

	status.tree_conn->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	if (conn->posix_ext_supported)
		status.tree_conn->posix_extensions = true;

out_err1:
	rsp->StructureSize = cpu_to_le16(16);
	rsp->Capabilities = 0;
	rsp->Reserved = 0;
	/* default manual caching */
	rsp->ShareFlags = SMB2_SHAREFLAG_MANUAL_CACHING;
	inc_rfc1001_len(work->response_buf, 16);

	if (!IS_ERR(treename))
		kfree(treename);
	if (!IS_ERR(name))
		kfree(name);

	switch (status.ret) {
	case KSMBD_TREE_CONN_STATUS_OK:
		rsp->hdr.Status = STATUS_SUCCESS;
		rc = 0;
		break;
	case KSMBD_TREE_CONN_STATUS_NO_SHARE:
		rsp->hdr.Status = STATUS_BAD_NETWORK_PATH;
		break;
	case -ENOMEM:
	case KSMBD_TREE_CONN_STATUS_NOMEM:
		rsp->hdr.Status = STATUS_NO_MEMORY;
		break;
	case KSMBD_TREE_CONN_STATUS_ERROR:
	case KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS:
	case KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS:
		rsp->hdr.Status = STATUS_ACCESS_DENIED;
		break;
	case -EINVAL:
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
		break;
	default:
		rsp->hdr.Status = STATUS_ACCESS_DENIED;
	}

	return rc;
}

/**
 * smb2_create_open_flags() - convert smb open flags to unix open flags
 * @file_present:	is file already present
 * @access:		file access flags
 * @disposition:	file disposition flags
 * @may_flags:		set with MAY_ flags
 *
 * Return:      file open flags
 */
static int smb2_create_open_flags(bool file_present, __le32 access,
				  __le32 disposition,
				  int *may_flags)
{
	int oflags = O_NONBLOCK | O_LARGEFILE;

	if (access & FILE_READ_DESIRED_ACCESS_LE &&
	    access & FILE_WRITE_DESIRE_ACCESS_LE) {
		oflags |= O_RDWR;
		*may_flags = MAY_OPEN | MAY_READ | MAY_WRITE;
	} else if (access & FILE_WRITE_DESIRE_ACCESS_LE) {
		oflags |= O_WRONLY;
		*may_flags = MAY_OPEN | MAY_WRITE;
	} else {
		oflags |= O_RDONLY;
		*may_flags = MAY_OPEN | MAY_READ;
	}

	if (access == FILE_READ_ATTRIBUTES_LE)
		oflags |= O_PATH;

	if (file_present) {
		switch (disposition & FILE_CREATE_MASK_LE) {
		case FILE_OPEN_LE:
		case FILE_CREATE_LE:
			break;
		case FILE_SUPERSEDE_LE:
		case FILE_OVERWRITE_LE:
		case FILE_OVERWRITE_IF_LE:
			oflags |= O_TRUNC;
			break;
		default:
			break;
		}
	} else {
		switch (disposition & FILE_CREATE_MASK_LE) {
		case FILE_SUPERSEDE_LE:
		case FILE_CREATE_LE:
		case FILE_OPEN_IF_LE:
		case FILE_OVERWRITE_IF_LE:
			oflags |= O_CREAT;
			break;
		case FILE_OPEN_LE:
		case FILE_OVERWRITE_LE:
			oflags &= ~O_CREAT;
			break;
		default:
			break;
		}
	}

	return oflags;
}

/**
 * smb2_tree_disconnect() - handler for smb tree connect request
 * @work:	smb work containing request buffer
 *
 * Return:      0
 */
int smb2_tree_disconnect(struct ksmbd_work *work)
{
	struct smb2_tree_disconnect_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_session *sess = work->sess;
	struct ksmbd_tree_connect *tcon = work->tcon;

	rsp->StructureSize = cpu_to_le16(4);
	inc_rfc1001_len(work->response_buf, 4);

	ksmbd_debug(SMB, "request\n");

	if (!tcon) {
		struct smb2_tree_disconnect_req *req =
			smb2_get_msg(work->request_buf);

		ksmbd_debug(SMB, "Invalid tid %d\n", req->hdr.Id.SyncId.TreeId);
		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
		smb2_set_err_rsp(work);
		return 0;
	}

	ksmbd_close_tree_conn_fds(work);
	ksmbd_tree_conn_disconnect(sess, tcon);
	return 0;
}

/**
 * smb2_session_logoff() - handler for session log off request
 * @work:	smb work containing request buffer
 *
 * Return:      0
 */
int smb2_session_logoff(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct smb2_logoff_rsp *rsp = smb2_get_msg(work->response_buf);
	struct ksmbd_session *sess = work->sess;

	rsp->StructureSize = cpu_to_le16(4);
	inc_rfc1001_len(work->response_buf, 4);

	ksmbd_debug(SMB, "request\n");

	/* Got a valid session, set connection state */
	WARN_ON(sess->conn != conn);

	/* setting CifsExiting here may race with start_tcp_sess */
	ksmbd_conn_set_need_reconnect(work);
	ksmbd_close_session_fds(work);
	ksmbd_conn_wait_idle(conn);

	if (ksmbd_tree_conn_session_logoff(sess)) {
		struct smb2_logoff_req *req = smb2_get_msg(work->request_buf);

		ksmbd_debug(SMB, "Invalid tid %d\n", req->hdr.Id.SyncId.TreeId);
		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
		smb2_set_err_rsp(work);
		return 0;
	}

	ksmbd_destroy_file_table(&sess->file_table);
	sess->state = SMB2_SESSION_EXPIRED;

	ksmbd_free_user(sess->user);
	sess->user = NULL;

	/* let start_tcp_sess free connection info now */
	ksmbd_conn_set_need_negotiate(work);
	return 0;
}

/**
 * create_smb2_pipe() - create IPC pipe
 * @work:	smb work containing request buffer
 *
 * Return:      0 on success, otherwise error
 */
static noinline int create_smb2_pipe(struct ksmbd_work *work)
{
	struct smb2_create_rsp *rsp = smb2_get_msg(work->response_buf);
	struct smb2_create_req *req = smb2_get_msg(work->request_buf);
	int id;
	int err;
	char *name;

	name = smb_strndup_from_utf16(req->Buffer, le16_to_cpu(req->NameLength),
				      1, work->conn->local_nls);
	if (IS_ERR(name)) {
		rsp->hdr.Status = STATUS_NO_MEMORY;
		err = PTR_ERR(name);
		goto out;
	}

	id = ksmbd_session_rpc_open(work->sess, name);
	if (id < 0) {
		pr_err("Unable to open RPC pipe: %d\n", id);
		err = id;
		goto out;
	}

	rsp->hdr.Status = STATUS_SUCCESS;
	rsp->StructureSize = cpu_to_le16(89);
	rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE;
	rsp->Flags = 0;
	rsp->CreateAction = cpu_to_le32(FILE_OPENED);

	rsp->CreationTime = cpu_to_le64(0);
	rsp->LastAccessTime = cpu_to_le64(0);
	rsp->ChangeTime = cpu_to_le64(0);
	rsp->AllocationSize = cpu_to_le64(0);
	rsp->EndofFile = cpu_to_le64(0);
	rsp->FileAttributes = FILE_ATTRIBUTE_NORMAL_LE;
	rsp->Reserved2 = 0;
	rsp->VolatileFileId = cpu_to_le64(id);
	rsp->PersistentFileId = 0;
	rsp->CreateContextsOffset = 0;
	rsp->CreateContextsLength = 0;

	inc_rfc1001_len(work->response_buf, 88); /* StructureSize - 1*/
	kfree(name);
	return 0;

out:
	switch (err) {
	case -EINVAL:
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
		break;
	case -ENOSPC:
	case -ENOMEM:
		rsp->hdr.Status = STATUS_NO_MEMORY;
		break;
	}

	if (!IS_ERR(name))
		kfree(name);

	smb2_set_err_rsp(work);
	return err;
}

/**
 * smb2_set_ea() - handler for setting extended attributes using set
 *		info command
 * @eabuf:	set info command buffer
 * @buf_len:	set info command buffer length
 * @path:	dentry path for get ea
 *
 * Return:	0 on success, otherwise error
 */
static int smb2_set_ea(struct smb2_ea_info *eabuf, unsigned int buf_len,
		       struct path *path)
{
	struct user_namespace *user_ns = mnt_user_ns(path->mnt);
	char *attr_name = NULL, *value;
	int rc = 0;
	unsigned int next = 0;

	if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength +
			le16_to_cpu(eabuf->EaValueLength))
		return -EINVAL;

	attr_name = kmalloc(XATTR_NAME_MAX + 1, GFP_KERNEL);
	if (!attr_name)
		return -ENOMEM;

	do {
		if (!eabuf->EaNameLength)
			goto next;

		ksmbd_debug(SMB,
			    "name : <%s>, name_len : %u, value_len : %u, next : %u\n",
			    eabuf->name, eabuf->EaNameLength,
			    le16_to_cpu(eabuf->EaValueLength),
			    le32_to_cpu(eabuf->NextEntryOffset));

		if (eabuf->EaNameLength >
		    (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) {
			rc = -EINVAL;
			break;
		}

		memcpy(attr_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
		memcpy(&attr_name[XATTR_USER_PREFIX_LEN], eabuf->name,
		       eabuf->EaNameLength);
		attr_name[XATTR_USER_PREFIX_LEN + eabuf->EaNameLength] = '\0';
		value = (char *)&eabuf->name + eabuf->EaNameLength + 1;

		if (!eabuf->EaValueLength) {
			rc = ksmbd_vfs_casexattr_len(user_ns,
						     path->dentry,
						     attr_name,
						     XATTR_USER_PREFIX_LEN +
						     eabuf->EaNameLength);

			/* delete the EA only when it exits */
			if (rc > 0) {
				rc = ksmbd_vfs_remove_xattr(user_ns,
							    path->dentry,
							    attr_name);

				if (rc < 0) {
					ksmbd_debug(SMB,
						    "remove xattr failed(%d)\n",
						    rc);
					break;
				}
			}

			/* if the EA doesn't exist, just do nothing. */
			rc = 0;
		} else {
			rc = ksmbd_vfs_setxattr(user_ns,
						path->dentry, attr_name, value,
						le16_to_cpu(eabuf->EaValueLength), 0);
			if (rc < 0) {
				ksmbd_debug(SMB,
					    "ksmbd_vfs_setxattr is failed(%d)\n",
					    rc);
				break;
			}
		}

next:
		next = le32_to_cpu(eabuf->NextEntryOffset);
		if (next == 0 || buf_len < next)
			break;
		buf_len -= next;
		eabuf = (struct smb2_ea_info *)((char *)eabuf + next);
		if (next < (u32)eabuf->EaNameLength + le16_to_cpu(eabuf->EaValueLength))
			break;

	} while (next != 0);

	kfree(attr_name);
	return rc;
}

static noinline int smb2_set_stream_name_xattr(struct path *path,
					       struct ksmbd_file *fp,
					       char *stream_name, int s_type)
{
	struct user_namespace *user_ns = mnt_user_ns(path->mnt);
	size_t xattr_stream_size;
	char *xattr_stream_name;
	int rc;

	rc = ksmbd_vfs_xattr_stream_name(stream_name,
					 &xattr_stream_name,
					 &xattr_stream_size,
					 s_type);
	if (rc)
		return rc;

	fp->stream.name = xattr_stream_name;
	fp->stream.size = xattr_stream_size;

	/* Check if there is stream prefix in xattr space */
	rc = ksmbd_vfs_casexattr_len(user_ns,
				     path->dentry,
				     xattr_stream_name,
				     xattr_stream_size);
	if (rc >= 0)
		return 0;

	if (fp->cdoption == FILE_OPEN_LE) {
		ksmbd_debug(SMB, "XATTR stream name lookup failed: %d\n", rc);
		return -EBADF;
	}

	rc = ksmbd_vfs_setxattr(user_ns, path->dentry,
				xattr_stream_name, NULL, 0, 0);
	if (rc < 0)
		pr_err("Failed to store XATTR stream name :%d\n", rc);
	return 0;
}

static int smb2_remove_smb_xattrs(struct path *path)
{
	struct user_namespace *user_ns = mnt_user_ns(path->mnt);
	char *name, *xattr_list = NULL;
	ssize_t xattr_list_len;
	int err = 0;

	xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
	if (xattr_list_len < 0) {
		goto out;
	} else if (!xattr_list_len) {
		ksmbd_debug(SMB, "empty xattr in the file\n");
		goto out;
	}

	for (name = xattr_list; name - xattr_list < xattr_list_len;
			name += strlen(name) + 1) {
		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));

		if (strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
		    strncmp(&name[XATTR_USER_PREFIX_LEN], DOS_ATTRIBUTE_PREFIX,
			    DOS_ATTRIBUTE_PREFIX_LEN) &&
		    strncmp(&name[XATTR_USER_PREFIX_LEN], STREAM_PREFIX, STREAM_PREFIX_LEN))
			continue;

		err = ksmbd_vfs_remove_xattr(user_ns, path->dentry, name);
		if (err)
			ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
	}
out:
	kvfree(xattr_list);
	return err;
}

static int smb2_create_truncate(struct path *path)
{
	int rc = vfs_truncate(path, 0);

	if (rc) {
		pr_err("vfs_truncate failed, rc %d\n", rc);
		return rc;
	}

	rc = smb2_remove_smb_xattrs(path);
	if (rc == -EOPNOTSUPP)
		rc = 0;
	if (rc)
		ksmbd_debug(SMB,
			    "ksmbd_truncate_stream_name_xattr failed, rc %d\n",
			    rc);
	return rc;
}

static void smb2_new_xattrs(struct ksmbd_tree_connect *tcon, struct path *path,
			    struct ksmbd_file *fp)
{
	struct xattr_dos_attrib da = {0};
	int rc;

	if (!test_share_config_flag(tcon->share_conf,
				    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS))
		return;

	da.version = 4;
	da.attr = le32_to_cpu(fp->f_ci->m_fattr);
	da.itime = da.create_time = fp->create_time;
	da.flags = XATTR_DOSINFO_ATTRIB | XATTR_DOSINFO_CREATE_TIME |
		XATTR_DOSINFO_ITIME;

	rc = ksmbd_vfs_set_dos_attrib_xattr(mnt_user_ns(path->mnt),
					    path->dentry, &da);
	if (rc)
		ksmbd_debug(SMB, "failed to store file attribute into xattr\n");
}

static void smb2_update_xattrs(struct ksmbd_tree_connect *tcon,
			       struct path *path, struct ksmbd_file *fp)
{
	struct xattr_dos_attrib da;
	int rc;

	fp->f_ci->m_fattr &= ~(FILE_ATTRIBUTE_HIDDEN_LE | FILE_ATTRIBUTE_SYSTEM_LE);

	/* get FileAttributes from XATTR_NAME_DOS_ATTRIBUTE */
	if (!test_share_config_flag(tcon->share_conf,
				    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS))
		return;

	rc = ksmbd_vfs_get_dos_attrib_xattr(mnt_user_ns(path->mnt),
					    path->dentry, &da);
	if (rc > 0) {
		fp->f_ci->m_fattr = cpu_to_le32(da.attr);
		fp->create_time = da.create_time;
		fp->itime = da.itime;
	}
}

static int smb2_creat(struct ksmbd_work *work, struct path *path, char *name,
		      int open_flags, umode_t posix_mode, bool is_dir)
{
	struct ksmbd_tree_connect *tcon = work->tcon;
	struct ksmbd_share_config *share = tcon->share_conf;
	umode_t mode;
	int rc;

	if (!(open_flags & O_CREAT))
		return -EBADF;

	ksmbd_debug(SMB, "file does not exist, so creating\n");
	if (is_dir == true) {
		ksmbd_debug(SMB, "creating directory\n");

		mode = share_config_directory_mode(share, posix_mode);
		rc = ksmbd_vfs_mkdir(work, name, mode);
		if (rc)
			return rc;
	} else {
		ksmbd_debug(SMB, "creating regular file\n");

		mode = share_config_create_mode(share, posix_mode);
		rc = ksmbd_vfs_create(work, name, mode);
		if (rc)
			return rc;
	}

	rc = ksmbd_vfs_kern_path(work, name, 0, path, 0);
	if (rc) {
		pr_err("cannot get linux path (%s), err = %d\n",
		       name, rc);
		return rc;
	}
	return 0;
}

static int smb2_create_sd_buffer(struct ksmbd_work *work,
				 struct smb2_create_req *req,
				 struct path *path)
{
	struct create_context *context;
	struct create_sd_buf_req *sd_buf;

	if (!req->CreateContextsOffset)
		return -ENOENT;

	/* Parse SD BUFFER create contexts */
	context = smb2_find_context_vals(req, SMB2_CREATE_SD_BUFFER);
	if (!context)
		return -ENOENT;
	else if (IS_ERR(context))
		return PTR_ERR(context);

	ksmbd_debug(SMB,
		    "Set ACLs using SMB2_CREATE_SD_BUFFER context\n");
	sd_buf = (struct create_sd_buf_req *)context;
	if (le16_to_cpu(context->DataOffset) +
	    le32_to_cpu(context->DataLength) <
	    sizeof(struct create_sd_buf_req))
		return -EINVAL;
	return set_info_sec(work->conn, work->tcon, path, &sd_buf->ntsd,
			    le32_to_cpu(sd_buf->ccontext.DataLength), true);
}

static void ksmbd_acls_fattr(struct smb_fattr *fattr,
			     struct user_namespace *mnt_userns,
			     struct inode *inode)
{
	fattr->cf_uid = i_uid_into_mnt(mnt_userns, inode);
	fattr->cf_gid = i_gid_into_mnt(mnt_userns, inode);
	fattr->cf_mode = inode->i_mode;
	fattr->cf_acls = NULL;
	fattr->cf_dacls = NULL;

	if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
		fattr->cf_acls = get_acl(inode, ACL_TYPE_ACCESS);
		if (S_ISDIR(inode->i_mode))
			fattr->cf_dacls = get_acl(inode, ACL_TYPE_DEFAULT);
	}
}

/**
 * smb2_open() - handler for smb file open request
 * @work:	smb work containing request buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_open(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct ksmbd_session *sess = work->sess;
	struct ksmbd_tree_connect *tcon = work->tcon;
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct path path;
	struct ksmbd_share_config *share = tcon->share_conf;
	struct ksmbd_file *fp = NULL;
	struct file *filp = NULL;
	struct user_namespace *user_ns = NULL;
	struct kstat stat;
	struct create_context *context;
	struct lease_ctx_info *lc = NULL;
	struct create_ea_buf_req *ea_buf = NULL;
	struct oplock_info *opinfo;
	__le32 *next_ptr = NULL;
	int req_op_level = 0, open_flags = 0, may_flags = 0, file_info = 0;
	int rc = 0;
	int contxt_cnt = 0, query_disk_id = 0;
	int maximal_access_ctxt = 0, posix_ctxt = 0;
	int s_type = 0;
	int next_off = 0;
	char *name = NULL;
	char *stream_name = NULL;
	bool file_present = false, created = false, already_permitted = false;
	int share_ret, need_truncate = 0;
	u64 time;
	umode_t posix_mode = 0;
	__le32 daccess, maximal_access = 0;

	WORK_BUFFERS(work, req, rsp);

	if (req->hdr.NextCommand && !work->next_smb2_rcv_hdr_off &&
	    (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
		ksmbd_debug(SMB, "invalid flag in chained command\n");
		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
		smb2_set_err_rsp(work);
		return -EINVAL;
	}

	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) {
		ksmbd_debug(SMB, "IPC pipe create request\n");
		return create_smb2_pipe(work);
	}

	if (req->NameLength) {
		if ((req->CreateOptions & FILE_DIRECTORY_FILE_LE) &&
		    *(char *)req->Buffer == '\\') {
			pr_err("not allow directory name included leading slash\n");
			rc = -EINVAL;
			goto err_out1;
		}

		name = smb2_get_name(share,
				     req->Buffer,
				     le16_to_cpu(req->NameLength),
				     work->conn->local_nls);
		if (IS_ERR(name)) {
			rc = PTR_ERR(name);
			if (rc != -ENOMEM)
				rc = -ENOENT;
			name = NULL;
			goto err_out1;
		}

		ksmbd_debug(SMB, "converted name = %s\n", name);
		if (strchr(name, ':')) {
			if (!test_share_config_flag(work->tcon->share_conf,
						    KSMBD_SHARE_FLAG_STREAMS)) {
				rc = -EBADF;
				goto err_out1;
			}
			rc = parse_stream_name(name, &stream_name, &s_type);
			if (rc < 0)
				goto err_out1;
		}

		rc = ksmbd_validate_filename(name);
		if (rc < 0)
			goto err_out1;

		if (ksmbd_share_veto_filename(share, name)) {
			rc = -ENOENT;
			ksmbd_debug(SMB, "Reject open(), vetoed file: %s\n",
				    name);
			goto err_out1;
		}
	} else {
		name = kstrdup("", GFP_KERNEL);
		if (!name) {
			rc = -ENOMEM;
			goto err_out1;
		}
	}

	req_op_level = req->RequestedOplockLevel;
	if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE)
		lc = parse_lease_state(req);

	if (le32_to_cpu(req->ImpersonationLevel) > le32_to_cpu(IL_DELEGATE)) {
		pr_err("Invalid impersonationlevel : 0x%x\n",
		       le32_to_cpu(req->ImpersonationLevel));
		rc = -EIO;
		rsp->hdr.Status = STATUS_BAD_IMPERSONATION_LEVEL;
		goto err_out1;
	}

	if (req->CreateOptions && !(req->CreateOptions & CREATE_OPTIONS_MASK_LE)) {
		pr_err("Invalid create options : 0x%x\n",
		       le32_to_cpu(req->CreateOptions));
		rc = -EINVAL;
		goto err_out1;
	} else {
		if (req->CreateOptions & FILE_SEQUENTIAL_ONLY_LE &&
		    req->CreateOptions & FILE_RANDOM_ACCESS_LE)
			req->CreateOptions = ~(FILE_SEQUENTIAL_ONLY_LE);

		if (req->CreateOptions &
		    (FILE_OPEN_BY_FILE_ID_LE | CREATE_TREE_CONNECTION |
		     FILE_RESERVE_OPFILTER_LE)) {
			rc = -EOPNOTSUPP;
			goto err_out1;
		}

		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE) {
			if (req->CreateOptions & FILE_NON_DIRECTORY_FILE_LE) {
				rc = -EINVAL;
				goto err_out1;
			} else if (req->CreateOptions & FILE_NO_COMPRESSION_LE) {
				req->CreateOptions = ~(FILE_NO_COMPRESSION_LE);
			}
		}
	}

	if (le32_to_cpu(req->CreateDisposition) >
	    le32_to_cpu(FILE_OVERWRITE_IF_LE)) {
		pr_err("Invalid create disposition : 0x%x\n",
		       le32_to_cpu(req->CreateDisposition));
		rc = -EINVAL;
		goto err_out1;
	}

	if (!(req->DesiredAccess & DESIRED_ACCESS_MASK)) {
		pr_err("Invalid desired access : 0x%x\n",
		       le32_to_cpu(req->DesiredAccess));
		rc = -EACCES;
		goto err_out1;
	}

	if (req->FileAttributes && !(req->FileAttributes & FILE_ATTRIBUTE_MASK_LE)) {
		pr_err("Invalid file attribute : 0x%x\n",
		       le32_to_cpu(req->FileAttributes));
		rc = -EINVAL;
		goto err_out1;
	}

	if (req->CreateContextsOffset) {
		/* Parse non-durable handle create contexts */
		context = smb2_find_context_vals(req, SMB2_CREATE_EA_BUFFER);
		if (IS_ERR(context)) {
			rc = PTR_ERR(context);
			goto err_out1;
		} else if (context) {
			ea_buf = (struct create_ea_buf_req *)context;
			if (le16_to_cpu(context->DataOffset) +
			    le32_to_cpu(context->DataLength) <
			    sizeof(struct create_ea_buf_req)) {
				rc = -EINVAL;
				goto err_out1;
			}
			if (req->CreateOptions & FILE_NO_EA_KNOWLEDGE_LE) {
				rsp->hdr.Status = STATUS_ACCESS_DENIED;
				rc = -EACCES;
				goto err_out1;
			}
		}

		context = smb2_find_context_vals(req,
						 SMB2_CREATE_QUERY_MAXIMAL_ACCESS_REQUEST);
		if (IS_ERR(context)) {
			rc = PTR_ERR(context);
			goto err_out1;
		} else if (context) {
			ksmbd_debug(SMB,
				    "get query maximal access context\n");
			maximal_access_ctxt = 1;
		}

		context = smb2_find_context_vals(req,
						 SMB2_CREATE_TIMEWARP_REQUEST);
		if (IS_ERR(context)) {
			rc = PTR_ERR(context);
			goto err_out1;
		} else if (context) {
			ksmbd_debug(SMB, "get timewarp context\n");
			rc = -EBADF;
			goto err_out1;
		}

		if (tcon->posix_extensions) {
			context = smb2_find_context_vals(req,
							 SMB2_CREATE_TAG_POSIX);
			if (IS_ERR(context)) {
				rc = PTR_ERR(context);
				goto err_out1;
			} else if (context) {
				struct create_posix *posix =
					(struct create_posix *)context;
				if (le16_to_cpu(context->DataOffset) +
				    le32_to_cpu(context->DataLength) <
				    sizeof(struct create_posix)) {
					rc = -EINVAL;
					goto err_out1;
				}
				ksmbd_debug(SMB, "get posix context\n");

				posix_mode = le32_to_cpu(posix->Mode);
				posix_ctxt = 1;
			}
		}
	}

	if (ksmbd_override_fsids(work)) {
		rc = -ENOMEM;
		goto err_out1;
	}

	rc = ksmbd_vfs_kern_path(work, name, LOOKUP_NO_SYMLINKS, &path, 1);
	if (!rc) {
		if (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE) {
			/*
			 * If file exists with under flags, return access
			 * denied error.
			 */
			if (req->CreateDisposition == FILE_OVERWRITE_IF_LE ||
			    req->CreateDisposition == FILE_OPEN_IF_LE) {
				rc = -EACCES;
				path_put(&path);
				goto err_out;
			}

			if (!test_tree_conn_flag(tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
				ksmbd_debug(SMB,
					    "User does not have write permission\n");
				rc = -EACCES;
				path_put(&path);
				goto err_out;
			}
		} else if (d_is_symlink(path.dentry)) {
			rc = -EACCES;
			path_put(&path);
			goto err_out;
		}
	}

	if (rc) {
		if (rc != -ENOENT)
			goto err_out;
		ksmbd_debug(SMB, "can not get linux path for %s, rc = %d\n",
			    name, rc);
		rc = 0;
	} else {
		file_present = true;
		user_ns = mnt_user_ns(path.mnt);
		generic_fillattr(user_ns, d_inode(path.dentry), &stat);
	}
	if (stream_name) {
		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE) {
			if (s_type == DATA_STREAM) {
				rc = -EIO;
				rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
			}
		} else {
			if (S_ISDIR(stat.mode) && s_type == DATA_STREAM) {
				rc = -EIO;
				rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
			}
		}

		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE &&
		    req->FileAttributes & FILE_ATTRIBUTE_NORMAL_LE) {
			rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
			rc = -EIO;
		}

		if (rc < 0)
			goto err_out;
	}

	if (file_present && req->CreateOptions & FILE_NON_DIRECTORY_FILE_LE &&
	    S_ISDIR(stat.mode) && !(req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
		ksmbd_debug(SMB, "open() argument is a directory: %s, %x\n",
			    name, req->CreateOptions);
		rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
		rc = -EIO;
		goto err_out;
	}

	if (file_present && (req->CreateOptions & FILE_DIRECTORY_FILE_LE) &&
	    !(req->CreateDisposition == FILE_CREATE_LE) &&
	    !S_ISDIR(stat.mode)) {
		rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
		rc = -EIO;
		goto err_out;
	}

	if (!stream_name && file_present &&
	    req->CreateDisposition == FILE_CREATE_LE) {
		rc = -EEXIST;
		goto err_out;
	}

	daccess = smb_map_generic_desired_access(req->DesiredAccess);

	if (file_present && !(req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
		rc = smb_check_perm_dacl(conn, &path, &daccess,
					 sess->user->uid);
		if (rc)
			goto err_out;
	}

	if (daccess & FILE_MAXIMAL_ACCESS_LE) {
		if (!file_present) {
			daccess = cpu_to_le32(GENERIC_ALL_FLAGS);
		} else {
			rc = ksmbd_vfs_query_maximal_access(user_ns,
							    path.dentry,
							    &daccess);
			if (rc)
				goto err_out;
			already_permitted = true;
		}
		maximal_access = daccess;
	}

	open_flags = smb2_create_open_flags(file_present, daccess,
					    req->CreateDisposition,
					    &may_flags);

	if (!test_tree_conn_flag(tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
		if (open_flags & O_CREAT) {
			ksmbd_debug(SMB,
				    "User does not have write permission\n");
			rc = -EACCES;
			goto err_out;
		}
	}

	/*create file if not present */
	if (!file_present) {
		rc = smb2_creat(work, &path, name, open_flags, posix_mode,
				req->CreateOptions & FILE_DIRECTORY_FILE_LE);
		if (rc) {
			if (rc == -ENOENT) {
				rc = -EIO;
				rsp->hdr.Status = STATUS_OBJECT_PATH_NOT_FOUND;
			}
			goto err_out;
		}

		created = true;
		user_ns = mnt_user_ns(path.mnt);
		if (ea_buf) {
			if (le32_to_cpu(ea_buf->ccontext.DataLength) <
			    sizeof(struct smb2_ea_info)) {
				rc = -EINVAL;
				goto err_out;
			}

			rc = smb2_set_ea(&ea_buf->ea,
					 le32_to_cpu(ea_buf->ccontext.DataLength),
					 &path);
			if (rc == -EOPNOTSUPP)
				rc = 0;
			else if (rc)
				goto err_out;
		}
	} else if (!already_permitted) {
		/* FILE_READ_ATTRIBUTE is allowed without inode_permission,
		 * because execute(search) permission on a parent directory,
		 * is already granted.
		 */
		if (daccess & ~(FILE_READ_ATTRIBUTES_LE | FILE_READ_CONTROL_LE)) {
			rc = inode_permission(user_ns,
					      d_inode(path.dentry),
					      may_flags);
			if (rc)
				goto err_out;

			if ((daccess & FILE_DELETE_LE) ||
			    (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
				rc = ksmbd_vfs_may_delete(user_ns,
							  path.dentry);
				if (rc)
					goto err_out;
			}
		}
	}

	rc = ksmbd_query_inode_status(d_inode(path.dentry->d_parent));
	if (rc == KSMBD_INODE_STATUS_PENDING_DELETE) {
		rc = -EBUSY;
		goto err_out;
	}

	rc = 0;
	filp = dentry_open(&path, open_flags, current_cred());
	if (IS_ERR(filp)) {
		rc = PTR_ERR(filp);
		pr_err("dentry open for dir failed, rc %d\n", rc);
		goto err_out;
	}

	if (file_present) {
		if (!(open_flags & O_TRUNC))
			file_info = FILE_OPENED;
		else
			file_info = FILE_OVERWRITTEN;

		if ((req->CreateDisposition & FILE_CREATE_MASK_LE) ==
		    FILE_SUPERSEDE_LE)
			file_info = FILE_SUPERSEDED;
	} else if (open_flags & O_CREAT) {
		file_info = FILE_CREATED;
	}

	ksmbd_vfs_set_fadvise(filp, req->CreateOptions);

	/* Obtain Volatile-ID */
	fp = ksmbd_open_fd(work, filp);
	if (IS_ERR(fp)) {
		fput(filp);
		rc = PTR_ERR(fp);
		fp = NULL;
		goto err_out;
	}

	/* Get Persistent-ID */
	ksmbd_open_durable_fd(fp);
	if (!has_file_id(fp->persistent_id)) {
		rc = -ENOMEM;
		goto err_out;
	}

	fp->filename = name;
	fp->cdoption = req->CreateDisposition;
	fp->daccess = daccess;
	fp->saccess = req->ShareAccess;
	fp->coption = req->CreateOptions;

	/* Set default windows and posix acls if creating new file */
	if (created) {
		int posix_acl_rc;
		struct inode *inode = d_inode(path.dentry);

		posix_acl_rc = ksmbd_vfs_inherit_posix_acl(user_ns,
							   inode,
							   d_inode(path.dentry->d_parent));
		if (posix_acl_rc)
			ksmbd_debug(SMB, "inherit posix acl failed : %d\n", posix_acl_rc);

		if (test_share_config_flag(work->tcon->share_conf,
					   KSMBD_SHARE_FLAG_ACL_XATTR)) {
			rc = smb_inherit_dacl(conn, &path, sess->user->uid,
					      sess->user->gid);
		}

		if (rc) {
			rc = smb2_create_sd_buffer(work, req, &path);
			if (rc) {
				if (posix_acl_rc)
					ksmbd_vfs_set_init_posix_acl(user_ns,
								     inode);

				if (test_share_config_flag(work->tcon->share_conf,
							   KSMBD_SHARE_FLAG_ACL_XATTR)) {
					struct smb_fattr fattr;
					struct smb_ntsd *pntsd;
					int pntsd_size, ace_num = 0;

					ksmbd_acls_fattr(&fattr, user_ns, inode);
					if (fattr.cf_acls)
						ace_num = fattr.cf_acls->a_count;
					if (fattr.cf_dacls)
						ace_num += fattr.cf_dacls->a_count;

					pntsd = kmalloc(sizeof(struct smb_ntsd) +
							sizeof(struct smb_sid) * 3 +
							sizeof(struct smb_acl) +
							sizeof(struct smb_ace) * ace_num * 2,
							GFP_KERNEL);
					if (!pntsd)
						goto err_out;

					rc = build_sec_desc(user_ns,
							    pntsd, NULL,
							    OWNER_SECINFO |
							    GROUP_SECINFO |
							    DACL_SECINFO,
							    &pntsd_size, &fattr);
					posix_acl_release(fattr.cf_acls);
					posix_acl_release(fattr.cf_dacls);

					rc = ksmbd_vfs_set_sd_xattr(conn,
								    user_ns,
								    path.dentry,
								    pntsd,
								    pntsd_size);
					kfree(pntsd);
					if (rc)
						pr_err("failed to store ntacl in xattr : %d\n",
						       rc);
				}
			}
		}
		rc = 0;
	}

	if (stream_name) {
		rc = smb2_set_stream_name_xattr(&path,
						fp,
						stream_name,
						s_type);
		if (rc)
			goto err_out;
		file_info = FILE_CREATED;
	}

	fp->attrib_only = !(req->DesiredAccess & ~(FILE_READ_ATTRIBUTES_LE |