[mirror_ubuntu-jammy-kernel.git] / 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 "smb2pdu.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 = work->request_buf;
                *rsp = 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 = work->request_buf;
        int tree_id;

        work->tcon = NULL;
        if (work->conn->ops->get_cmd_val(work) == SMB2_TREE_CONNECT_HE ||
            work->conn->ops->get_cmd_val(work) ==  SMB2_CANCEL_HE ||
            work->conn->ops->get_cmd_val(work) ==  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 = 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 = 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 = 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 = 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 = 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;

        rsp_hdr = work->response_buf;

        memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);

        rsp_hdr->smb2_buf_length =
                cpu_to_be32(smb2_hdr_size_no_buflen(conn->vals));

        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 = 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) +
                sizeof(rsp->hdr.smb2_buf_length)) +
                le16_to_cpu(rsp->SecurityBufferOffset));
        inc_rfc1001_len(rsp, 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) - 4)
                        + 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 + 4, 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 = 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 = work->response_buf;
        struct smb2_hdr *rcv_hdr = work->request_buf;
        struct ksmbd_conn *conn = work->conn;

        memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
        rsp_hdr->smb2_buf_length =
                cpu_to_be32(smb2_hdr_size_no_buflen(conn->vals));
        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 = 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 = 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 = 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 = 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 = 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 = ATTR_DIRECTORY |
                        (attribute & (ATTR_HIDDEN | ATTR_SYSTEM));
        } else {
                attr = (attribute & 0x00005137) | ATTR_ARCHIVE;
                attr &= ~(ATTR_DIRECTORY);
                if (S_ISREG(stat->mode) && (server_conf.share_fake_fscaps &
                                FILE_SUPPORTS_SPARSE_FILES))
                        attr |= ATTR_SPARSE;

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

        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_ctx *pneg_ctxt,
                                   __le16 comp_algo)
{
        pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
        pneg_ctxt->DataLength =
                cpu_to_le16(sizeof(struct smb2_compression_ctx)
                        - sizeof(struct smb2_neg_context));
        pneg_ctxt->Reserved = cpu_to_le32(0);
        pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(1);
        pneg_ctxt->Reserved1 = 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)
{
        /* +4 is to account for the RFC1001 len field */
        char *pneg_ctxt = (char *)rsp +
                        le32_to_cpu(rsp->NegotiateContextOffset) + 4;
        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(rsp, 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_ctx *)pneg_ctxt,
                                       conn->compress_algorithm);
                rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
                ctxt_size += sizeof(struct smb2_compression_ctx) + 2;
                /* Round to 8 byte boundary */
                pneg_ctxt += round_up(sizeof(struct smb2_compression_ctx) + 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(rsp, 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_ctx *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 ||
                    pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_AES_CMAC) {
                        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)
{
        /* +4 is to account for the RFC1001 len field */
        struct smb2_neg_context *pctx = (struct smb2_neg_context *)((char *)req + 4);
        int i = 0, len_of_ctxts;
        int offset = le32_to_cpu(req->NegotiateContextOffset);
        int neg_ctxt_cnt = le16_to_cpu(req->NegotiateContextCount);
        int len_of_smb = be32_to_cpu(req->hdr.smb2_buf_length);
        __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_ctx *)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 = work->request_buf;
        struct smb2_negotiate_rsp *rsp = 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) - 4;
        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);
                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);
                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) +
                                  sizeof(rsp->hdr.smb2_buf_length)) +
                                   le16_to_cpu(rsp->SecurityBufferOffset));
        inc_rfc1001_len(rsp, 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 = 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 = work->request_buf;
        struct smb2_sess_setup_rsp *rsp = 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(rsp, 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 = work->request_buf;
        struct smb2_sess_setup_rsp *rsp = 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 -
                offsetof(struct smb2_hdr, smb2_buf_length) -
                le16_to_cpu(rsp->SecurityBufferOffset);

        /* 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(rsp, 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 = work->request_buf;
        struct smb2_sess_setup_rsp *rsp = 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(rsp, 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) - 4) ||
            negblob_len < offsetof(struct negotiate_message, NegotiateFlags))
                return -EINVAL;

        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(rsp, 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 = work->request_buf;
        struct smb2_tree_connect_rsp *rsp = 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(rsp, 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 = 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(rsp, 4);

        ksmbd_debug(SMB, "request\n");

        if (!tcon) {
                struct smb2_tree_disconnect_req *req = 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 = work->response_buf;
        struct ksmbd_session *sess = work->sess;

        rsp->StructureSize = cpu_to_le16(4);
        inc_rfc1001_len(rsp, 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 = 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 = work->response_buf;
        struct smb2_create_req *req = 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->Reserved = 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 = ATTR_NORMAL_LE;
        rsp->Reserved2 = 0;
        rsp->VolatileFileId = cpu_to_le64(id);
        rsp->PersistentFileId = 0;
        rsp->CreateContextsOffset = 0;
        rsp->CreateContextsLength = 0;

        inc_rfc1001_len(rsp, 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 &= ~(ATTR_HIDDEN_LE | ATTR_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, *rsp_org;
        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;

        rsp_org = work->response_buf;
        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_LE)) {
                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)) {
                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 & ATTR_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 & ATTR_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 |
                        FILE_WRITE_ATTRIBUTES_LE | FILE_SYNCHRONIZE_LE));
        if (!S_ISDIR(file_inode(filp)->i_mode) && open_flags & O_TRUNC &&
            !fp->attrib_only && !stream_name) {
                smb_break_all_oplock(work, fp);
                need_truncate = 1;
        }

        /* fp should be searchable through ksmbd_inode.m_fp_list
         * after daccess, saccess, attrib_only, and stream are
         * initialized.
         */
        write_lock(&fp->f_ci->m_lock);
        list_add(&fp->node, &fp->f_ci->m_fp_list);
        write_unlock(&fp->f_ci->m_lock);

        rc = ksmbd_vfs_getattr(&path, &stat);
        if (rc) {
                generic_fillattr(user_ns, d_inode(path.dentry), &stat);
                rc = 0;
        }

        /* Check delete pending among previous fp before oplock break */
        if (ksmbd_inode_pending_delete(fp)) {
                rc = -EBUSY;
                goto err_out;
        }

        share_ret = ksmbd_smb_check_shared_mode(fp->filp, fp);
        if (!test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_OPLOCKS) ||
            (req_op_level == SMB2_OPLOCK_LEVEL_LEASE &&
             !(conn->vals->capabilities & SMB2_GLOBAL_CAP_LEASING))) {
                if (share_ret < 0 && !S_ISDIR(file_inode(fp->filp)->i_mode)) {
                        rc = share_ret;
                        goto err_out;
                }
        } else {
                if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) {
                        req_op_level = smb2_map_lease_to_oplock(lc->req_state);
                        ksmbd_debug(SMB,
                                    "lease req for(%s) req oplock state 0x%x, lease state 0x%x\n",
                                    name, req_op_level, lc->req_state);
                        rc = find_same_lease_key(sess, fp->f_ci, lc);
                        if (rc)
                                goto err_out;
                } else if (open_flags == O_RDONLY &&
                           (req_op_level == SMB2_OPLOCK_LEVEL_BATCH ||
                            req_op_level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
                        req_op_level = SMB2_OPLOCK_LEVEL_II;

                rc = smb_grant_oplock(work, req_op_level,
                                      fp->persistent_id, fp,
                                      le32_to_cpu(req->hdr.Id.SyncId.TreeId),
                                      lc, share_ret);
                if (rc < 0)
                        goto err_out;
        }

        if (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)
                ksmbd_fd_set_delete_on_close(fp, file_info);

        if (need_truncate) {
                rc = smb2_create_truncate(&path);
                if (rc)
                        goto err_out;
        }

        if (req->CreateContextsOffset) {
                struct create_alloc_size_req *az_req;

                az_req = (struct create_alloc_size_req *)smb2_find_context_vals(req,
                                        SMB2_CREATE_ALLOCATION_SIZE);
                if (IS_ERR(az_req)) {
                        rc = PTR_ERR(az_req);
                        goto err_out;
                } else if (az_req) {
                        loff_t alloc_size;
                        int err;

                        if (le16_to_cpu(az_req->ccontext.DataOffset) +
                            le32_to_cpu(az_req->ccontext.DataLength) <
                            sizeof(struct create_alloc_size_req)) {
                                rc = -EINVAL;
                                goto err_out;
                        }
                        alloc_size = le64_to_cpu(az_req->AllocationSize);
                        ksmbd_debug(SMB,
                                    "request smb2 create allocate size : %llu\n",
                                    alloc_size);
                        smb_break_all_levII_oplock(work, fp, 1);
                        err = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0,
                                            alloc_size);
                        if (err < 0)
                                ksmbd_debug(SMB,
                                            "vfs_fallocate is failed : %d\n",
                                            err);
                }

                context = smb2_find_context_vals(req, SMB2_CREATE_QUERY_ON_DISK_ID);
                if (IS_ERR(context)) {
                        rc = PTR_ERR(context);
                        goto err_out;
                } else if (context) {
                        ksmbd_debug(SMB, "get query on disk id context\n");
                        query_disk_id = 1;
                }
        }

        if (stat.result_mask & STATX_BTIME)
                fp->create_time = ksmbd_UnixTimeToNT(stat.btime);
        else
                fp->create_time = ksmbd_UnixTimeToNT(stat.ctime);
        if (req->FileAttributes || fp->f_ci->m_fattr == 0)
                fp->f_ci->m_fattr =
                        cpu_to_le32(smb2_get_dos_mode(&stat, le32_to_cpu(req->FileAttributes)));

        if (!created)
                smb2_update_xattrs(tcon, &path, fp);
        else
                smb2_new_xattrs(tcon, &path, fp);

        memcpy(fp->client_guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);

        generic_fillattr(user_ns, file_inode(fp->filp),
                         &stat);

        rsp->StructureSize = cpu_to_le16(89);
        rcu_read_lock();
        opinfo = rcu_dereference(fp->f_opinfo);
        rsp->OplockLevel = opinfo != NULL ? opinfo->level : 0;
        rcu_read_unlock();
        rsp->Reserved = 0;
        rsp->CreateAction = cpu_to_le32(file_info);
        rsp->CreationTime = cpu_to_le64(fp->create_time);
        time = ksmbd_UnixTimeToNT(stat.atime);
        rsp->LastAccessTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.mtime);
        rsp->LastWriteTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.ctime);
        rsp->ChangeTime = cpu_to_le64(time);
        rsp->AllocationSize = S_ISDIR(stat.mode) ? 0 :
                cpu_to_le64(stat.blocks << 9);
        rsp->EndofFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
        rsp->FileAttributes = fp->f_ci->m_fattr;

        rsp->Reserved2 = 0;

        rsp->PersistentFileId = cpu_to_le64(fp->persistent_id);
        rsp->VolatileFileId = cpu_to_le64(fp->volatile_id);

        rsp->CreateContextsOffset = 0;
        rsp->CreateContextsLength = 0;
        inc_rfc1001_len(rsp_org, 88); /* StructureSize - 1*/

        /* If lease is request send lease context response */
        if (opinfo && opinfo->is_lease) {
                struct create_context *lease_ccontext;

                ksmbd_debug(SMB, "lease granted on(%s) lease state 0x%x\n",
                            name, opinfo->o_lease->state);
                rsp->OplockLevel = SMB2_OPLOCK_LEVEL_LEASE;

                lease_ccontext = (struct create_context *)rsp->Buffer;
                contxt_cnt++;
                create_lease_buf(rsp->Buffer, opinfo->o_lease);
                le32_add_cpu(&rsp->CreateContextsLength,
                             conn->vals->create_lease_size);
                inc_rfc1001_len(rsp_org, conn->vals->create_lease_size);
                next_ptr = &lease_ccontext->Next;
                next_off = conn->vals->create_lease_size;
        }

        if (maximal_access_ctxt) {
                struct create_context *mxac_ccontext;

                if (maximal_access == 0)
                        ksmbd_vfs_query_maximal_access(user_ns,
                                                       path.dentry,
                                                       &maximal_access);
                mxac_ccontext = (struct create_context *)(rsp->Buffer +
                                le32_to_cpu(rsp->CreateContextsLength));
                contxt_cnt++;
                create_mxac_rsp_buf(rsp->Buffer +
                                le32_to_cpu(rsp->CreateContextsLength),
                                le32_to_cpu(maximal_access));
                le32_add_cpu(&rsp->CreateContextsLength,
                             conn->vals->create_mxac_size);
                inc_rfc1001_len(rsp_org, conn->vals->create_mxac_size);
                if (next_ptr)
                        *next_ptr = cpu_to_le32(next_off);
                next_ptr = &mxac_ccontext->Next;
                next_off = conn->vals->create_mxac_size;
        }

        if (query_disk_id) {
                struct create_context *disk_id_ccontext;

                disk_id_ccontext = (struct create_context *)(rsp->Buffer +
                                le32_to_cpu(rsp->CreateContextsLength));
                contxt_cnt++;
                create_disk_id_rsp_buf(rsp->Buffer +
                                le32_to_cpu(rsp->CreateContextsLength),
                                stat.ino, tcon->id);
                le32_add_cpu(&rsp->CreateContextsLength,
                             conn->vals->create_disk_id_size);
                inc_rfc1001_len(rsp_org, conn->vals->create_disk_id_size);
                if (next_ptr)
                        *next_ptr = cpu_to_le32(next_off);
                next_ptr = &disk_id_ccontext->Next;
                next_off = conn->vals->create_disk_id_size;
        }

        if (posix_ctxt) {
                contxt_cnt++;
                create_posix_rsp_buf(rsp->Buffer +
                                le32_to_cpu(rsp->CreateContextsLength),
                                fp);
                le32_add_cpu(&rsp->CreateContextsLength,
                             conn->vals->create_posix_size);
                inc_rfc1001_len(rsp_org, conn->vals->create_posix_size);
                if (next_ptr)
                        *next_ptr = cpu_to_le32(next_off);
        }

        if (contxt_cnt > 0) {
                rsp->CreateContextsOffset =
                        cpu_to_le32(offsetof(struct smb2_create_rsp, Buffer)
                        - 4);
        }

err_out:
        if (file_present || created)
                path_put(&path);
        ksmbd_revert_fsids(work);
err_out1:
        if (rc) {
                if (rc == -EINVAL)
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                else if (rc == -EOPNOTSUPP)
                        rsp->hdr.Status = STATUS_NOT_SUPPORTED;
                else if (rc == -EACCES || rc == -ESTALE || rc == -EXDEV)
                        rsp->hdr.Status = STATUS_ACCESS_DENIED;
                else if (rc == -ENOENT)
                        rsp->hdr.Status = STATUS_OBJECT_NAME_INVALID;
                else if (rc == -EPERM)
                        rsp->hdr.Status = STATUS_SHARING_VIOLATION;
                else if (rc == -EBUSY)
                        rsp->hdr.Status = STATUS_DELETE_PENDING;
                else if (rc == -EBADF)
                        rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
                else if (rc == -ENOEXEC)
                        rsp->hdr.Status = STATUS_DUPLICATE_OBJECTID;
                else if (rc == -ENXIO)
                        rsp->hdr.Status = STATUS_NO_SUCH_DEVICE;
                else if (rc == -EEXIST)
                        rsp->hdr.Status = STATUS_OBJECT_NAME_COLLISION;
                else if (rc == -EMFILE)
                        rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
                if (!rsp->hdr.Status)
                        rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;

                if (!fp || !fp->filename)
                        kfree(name);
                if (fp)
                        ksmbd_fd_put(work, fp);
                smb2_set_err_rsp(work);
                ksmbd_debug(SMB, "Error response: %x\n", rsp->hdr.Status);
        }

        kfree(lc);

        return 0;
}

static int readdir_info_level_struct_sz(int info_level)
{
        switch (info_level) {
        case FILE_FULL_DIRECTORY_INFORMATION:
                return sizeof(struct file_full_directory_info);
        case FILE_BOTH_DIRECTORY_INFORMATION:
                return sizeof(struct file_both_directory_info);
        case FILE_DIRECTORY_INFORMATION:
                return sizeof(struct file_directory_info);
        case FILE_NAMES_INFORMATION:
                return sizeof(struct file_names_info);
        case FILEID_FULL_DIRECTORY_INFORMATION:
                return sizeof(struct file_id_full_dir_info);
        case FILEID_BOTH_DIRECTORY_INFORMATION:
                return sizeof(struct file_id_both_directory_info);
        case SMB_FIND_FILE_POSIX_INFO:
                return sizeof(struct smb2_posix_info);
        default:
                return -EOPNOTSUPP;
        }
}

static int dentry_name(struct ksmbd_dir_info *d_info, int info_level)
{
        switch (info_level) {
        case FILE_FULL_DIRECTORY_INFORMATION:
        {
                struct file_full_directory_info *ffdinfo;

                ffdinfo = (struct file_full_directory_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(ffdinfo->NextEntryOffset);
                d_info->name = ffdinfo->FileName;
                d_info->name_len = le32_to_cpu(ffdinfo->FileNameLength);
                return 0;
        }
        case FILE_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_both_directory_info *fbdinfo;

                fbdinfo = (struct file_both_directory_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(fbdinfo->NextEntryOffset);
                d_info->name = fbdinfo->FileName;
                d_info->name_len = le32_to_cpu(fbdinfo->FileNameLength);
                return 0;
        }
        case FILE_DIRECTORY_INFORMATION:
        {
                struct file_directory_info *fdinfo;

                fdinfo = (struct file_directory_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(fdinfo->NextEntryOffset);
                d_info->name = fdinfo->FileName;
                d_info->name_len = le32_to_cpu(fdinfo->FileNameLength);
                return 0;
        }
        case FILE_NAMES_INFORMATION:
        {
                struct file_names_info *fninfo;

                fninfo = (struct file_names_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(fninfo->NextEntryOffset);
                d_info->name = fninfo->FileName;
                d_info->name_len = le32_to_cpu(fninfo->FileNameLength);
                return 0;
        }
        case FILEID_FULL_DIRECTORY_INFORMATION:
        {
                struct file_id_full_dir_info *dinfo;

                dinfo = (struct file_id_full_dir_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(dinfo->NextEntryOffset);
                d_info->name = dinfo->FileName;
                d_info->name_len = le32_to_cpu(dinfo->FileNameLength);
                return 0;
        }
        case FILEID_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_id_both_directory_info *fibdinfo;

                fibdinfo = (struct file_id_both_directory_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(fibdinfo->NextEntryOffset);
                d_info->name = fibdinfo->FileName;
                d_info->name_len = le32_to_cpu(fibdinfo->FileNameLength);
                return 0;
        }
        case SMB_FIND_FILE_POSIX_INFO:
        {
                struct smb2_posix_info *posix_info;

                posix_info = (struct smb2_posix_info *)d_info->rptr;
                d_info->rptr += le32_to_cpu(posix_info->NextEntryOffset);
                d_info->name = posix_info->name;
                d_info->name_len = le32_to_cpu(posix_info->name_len);
                return 0;
        }
        default:
                return -EINVAL;
        }
}

/**
 * smb2_populate_readdir_entry() - encode directory entry in smb2 response
 * buffer
 * @conn:       connection instance
 * @info_level: smb information level
 * @d_info:     structure included variables for query dir
 * @user_ns:    user namespace
 * @ksmbd_kstat:        ksmbd wrapper of dirent stat information
 *
 * if directory has many entries, find first can't read it fully.
 * find next might be called multiple times to read remaining dir entries
 *
 * Return:      0 on success, otherwise error
 */
static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level,
                                       struct ksmbd_dir_info *d_info,
                                       struct ksmbd_kstat *ksmbd_kstat)
{
        int next_entry_offset = 0;
        char *conv_name;
        int conv_len;
        void *kstat;
        int struct_sz, rc = 0;

        conv_name = ksmbd_convert_dir_info_name(d_info,
                                                conn->local_nls,
                                                &conv_len);
        if (!conv_name)
                return -ENOMEM;

        /* Somehow the name has only terminating NULL bytes */
        if (conv_len < 0) {
                rc = -EINVAL;
                goto free_conv_name;
        }

        struct_sz = readdir_info_level_struct_sz(info_level);
        next_entry_offset = ALIGN(struct_sz - 1 + conv_len,
                                  KSMBD_DIR_INFO_ALIGNMENT);

        if (next_entry_offset > d_info->out_buf_len) {
                d_info->out_buf_len = 0;
                rc = -ENOSPC;
                goto free_conv_name;
        }

        kstat = d_info->wptr;
        if (info_level != FILE_NAMES_INFORMATION)
                kstat = ksmbd_vfs_init_kstat(&d_info->wptr, ksmbd_kstat);

        switch (info_level) {
        case FILE_FULL_DIRECTORY_INFORMATION:
        {
                struct file_full_directory_info *ffdinfo;

                ffdinfo = (struct file_full_directory_info *)kstat;
                ffdinfo->FileNameLength = cpu_to_le32(conv_len);
                ffdinfo->EaSize =
                        smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
                if (ffdinfo->EaSize)
                        ffdinfo->ExtFileAttributes = ATTR_REPARSE_POINT_LE;
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        ffdinfo->ExtFileAttributes |= ATTR_HIDDEN_LE;
                memcpy(ffdinfo->FileName, conv_name, conv_len);
                ffdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_both_directory_info *fbdinfo;

                fbdinfo = (struct file_both_directory_info *)kstat;
                fbdinfo->FileNameLength = cpu_to_le32(conv_len);
                fbdinfo->EaSize =
                        smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
                if (fbdinfo->EaSize)
                        fbdinfo->ExtFileAttributes = ATTR_REPARSE_POINT_LE;
                fbdinfo->ShortNameLength = 0;
                fbdinfo->Reserved = 0;
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        fbdinfo->ExtFileAttributes |= ATTR_HIDDEN_LE;
                memcpy(fbdinfo->FileName, conv_name, conv_len);
                fbdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_DIRECTORY_INFORMATION:
        {
                struct file_directory_info *fdinfo;

                fdinfo = (struct file_directory_info *)kstat;
                fdinfo->FileNameLength = cpu_to_le32(conv_len);
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        fdinfo->ExtFileAttributes |= ATTR_HIDDEN_LE;
                memcpy(fdinfo->FileName, conv_name, conv_len);
                fdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_NAMES_INFORMATION:
        {
                struct file_names_info *fninfo;

                fninfo = (struct file_names_info *)kstat;
                fninfo->FileNameLength = cpu_to_le32(conv_len);
                memcpy(fninfo->FileName, conv_name, conv_len);
                fninfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILEID_FULL_DIRECTORY_INFORMATION:
        {
                struct file_id_full_dir_info *dinfo;

                dinfo = (struct file_id_full_dir_info *)kstat;
                dinfo->FileNameLength = cpu_to_le32(conv_len);
                dinfo->EaSize =
                        smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
                if (dinfo->EaSize)
                        dinfo->ExtFileAttributes = ATTR_REPARSE_POINT_LE;
                dinfo->Reserved = 0;
                dinfo->UniqueId = cpu_to_le64(ksmbd_kstat->kstat->ino);
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        dinfo->ExtFileAttributes |= ATTR_HIDDEN_LE;
                memcpy(dinfo->FileName, conv_name, conv_len);
                dinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILEID_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_id_both_directory_info *fibdinfo;

                fibdinfo = (struct file_id_both_directory_info *)kstat;
                fibdinfo->FileNameLength = cpu_to_le32(conv_len);
                fibdinfo->EaSize =
                        smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
                if (fibdinfo->EaSize)
                        fibdinfo->ExtFileAttributes = ATTR_REPARSE_POINT_LE;
                fibdinfo->UniqueId = cpu_to_le64(ksmbd_kstat->kstat->ino);
                fibdinfo->ShortNameLength = 0;
                fibdinfo->Reserved = 0;
                fibdinfo->Reserved2 = cpu_to_le16(0);
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        fibdinfo->ExtFileAttributes |= ATTR_HIDDEN_LE;
                memcpy(fibdinfo->FileName, conv_name, conv_len);
                fibdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case SMB_FIND_FILE_POSIX_INFO:
        {
                struct smb2_posix_info *posix_info;
                u64 time;

                posix_info = (struct smb2_posix_info *)kstat;
                posix_info->Ignored = 0;
                posix_info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
                time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
                posix_info->ChangeTime = cpu_to_le64(time);
                time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->atime);
                posix_info->LastAccessTime = cpu_to_le64(time);
                time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->mtime);
                posix_info->LastWriteTime = cpu_to_le64(time);
                posix_info->EndOfFile = cpu_to_le64(ksmbd_kstat->kstat->size);
                posix_info->AllocationSize = cpu_to_le64(ksmbd_kstat->kstat->blocks << 9);
                posix_info->DeviceId = cpu_to_le32(ksmbd_kstat->kstat->rdev);
                posix_info->HardLinks = cpu_to_le32(ksmbd_kstat->kstat->nlink);
                posix_info->Mode = cpu_to_le32(ksmbd_kstat->kstat->mode);
                posix_info->Inode = cpu_to_le64(ksmbd_kstat->kstat->ino);
                posix_info->DosAttributes =
                        S_ISDIR(ksmbd_kstat->kstat->mode) ? ATTR_DIRECTORY_LE : ATTR_ARCHIVE_LE;
                if (d_info->hide_dot_file && d_info->name[0] == '.')
                        posix_info->DosAttributes |= ATTR_HIDDEN_LE;
                id_to_sid(from_kuid_munged(&init_user_ns, ksmbd_kstat->kstat->uid),
                          SIDNFS_USER, (struct smb_sid *)&posix_info->SidBuffer[0]);
                id_to_sid(from_kgid_munged(&init_user_ns, ksmbd_kstat->kstat->gid),
                          SIDNFS_GROUP, (struct smb_sid *)&posix_info->SidBuffer[20]);
                memcpy(posix_info->name, conv_name, conv_len);
                posix_info->name_len = cpu_to_le32(conv_len);
                posix_info->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }

        } /* switch (info_level) */

        d_info->last_entry_offset = d_info->data_count;
        d_info->data_count += next_entry_offset;
        d_info->out_buf_len -= next_entry_offset;
        d_info->wptr += next_entry_offset;

        ksmbd_debug(SMB,
                    "info_level : %d, buf_len :%d, next_offset : %d, data_count : %d\n",
                    info_level, d_info->out_buf_len,
                    next_entry_offset, d_info->data_count);

free_conv_name:
        kfree(conv_name);
        return rc;
}

struct smb2_query_dir_private {
        struct ksmbd_work       *work;
        char                    *search_pattern;
        struct ksmbd_file       *dir_fp;

        struct ksmbd_dir_info   *d_info;
        int                     info_level;
};

static void lock_dir(struct ksmbd_file *dir_fp)
{
        struct dentry *dir = dir_fp->filp->f_path.dentry;

        inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
}

static void unlock_dir(struct ksmbd_file *dir_fp)
{
        struct dentry *dir = dir_fp->filp->f_path.dentry;

        inode_unlock(d_inode(dir));
}

static int process_query_dir_entries(struct smb2_query_dir_private *priv)
{
        struct user_namespace   *user_ns = file_mnt_user_ns(priv->dir_fp->filp);
        struct kstat            kstat;
        struct ksmbd_kstat      ksmbd_kstat;
        int                     rc;
        int                     i;

        for (i = 0; i < priv->d_info->num_entry; i++) {
                struct dentry *dent;

                if (dentry_name(priv->d_info, priv->info_level))
                        return -EINVAL;

                lock_dir(priv->dir_fp);
                dent = lookup_one(user_ns, priv->d_info->name,
                                  priv->dir_fp->filp->f_path.dentry,
                                  priv->d_info->name_len);
                unlock_dir(priv->dir_fp);

                if (IS_ERR(dent)) {
                        ksmbd_debug(SMB, "Cannot lookup `%s' [%ld]\n",
                                    priv->d_info->name,
                                    PTR_ERR(dent));
                        continue;
                }
                if (unlikely(d_is_negative(dent))) {
                        dput(dent);
                        ksmbd_debug(SMB, "Negative dentry `%s'\n",
                                    priv->d_info->name);
                        continue;
                }

                ksmbd_kstat.kstat = &kstat;
                if (priv->info_level != FILE_NAMES_INFORMATION)
                        ksmbd_vfs_fill_dentry_attrs(priv->work,
                                                    user_ns,
                                                    dent,
                                                    &ksmbd_kstat);

                rc = smb2_populate_readdir_entry(priv->work->conn,
                                                 priv->info_level,
                                                 priv->d_info,
                                                 &ksmbd_kstat);
                dput(dent);
                if (rc)
                        return rc;
        }
        return 0;
}

static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
                                   int info_level)
{
        int struct_sz;
        int conv_len;
        int next_entry_offset;

        struct_sz = readdir_info_level_struct_sz(info_level);
        if (struct_sz == -EOPNOTSUPP)
                return -EOPNOTSUPP;

        conv_len = (d_info->name_len + 1) * 2;
        next_entry_offset = ALIGN(struct_sz - 1 + conv_len,
                                  KSMBD_DIR_INFO_ALIGNMENT);

        if (next_entry_offset > d_info->out_buf_len) {
                d_info->out_buf_len = 0;
                return -ENOSPC;
        }

        switch (info_level) {
        case FILE_FULL_DIRECTORY_INFORMATION:
        {
                struct file_full_directory_info *ffdinfo;

                ffdinfo = (struct file_full_directory_info *)d_info->wptr;
                memcpy(ffdinfo->FileName, d_info->name, d_info->name_len);
                ffdinfo->FileName[d_info->name_len] = 0x00;
                ffdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
                ffdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_both_directory_info *fbdinfo;

                fbdinfo = (struct file_both_directory_info *)d_info->wptr;
                memcpy(fbdinfo->FileName, d_info->name, d_info->name_len);
                fbdinfo->FileName[d_info->name_len] = 0x00;
                fbdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
                fbdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_DIRECTORY_INFORMATION:
        {
                struct file_directory_info *fdinfo;

                fdinfo = (struct file_directory_info *)d_info->wptr;
                memcpy(fdinfo->FileName, d_info->name, d_info->name_len);
                fdinfo->FileName[d_info->name_len] = 0x00;
                fdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
                fdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILE_NAMES_INFORMATION:
        {
                struct file_names_info *fninfo;

                fninfo = (struct file_names_info *)d_info->wptr;
                memcpy(fninfo->FileName, d_info->name, d_info->name_len);
                fninfo->FileName[d_info->name_len] = 0x00;
                fninfo->FileNameLength = cpu_to_le32(d_info->name_len);
                fninfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILEID_FULL_DIRECTORY_INFORMATION:
        {
                struct file_id_full_dir_info *dinfo;

                dinfo = (struct file_id_full_dir_info *)d_info->wptr;
                memcpy(dinfo->FileName, d_info->name, d_info->name_len);
                dinfo->FileName[d_info->name_len] = 0x00;
                dinfo->FileNameLength = cpu_to_le32(d_info->name_len);
                dinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case FILEID_BOTH_DIRECTORY_INFORMATION:
        {
                struct file_id_both_directory_info *fibdinfo;

                fibdinfo = (struct file_id_both_directory_info *)d_info->wptr;
                memcpy(fibdinfo->FileName, d_info->name, d_info->name_len);
                fibdinfo->FileName[d_info->name_len] = 0x00;
                fibdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
                fibdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
                break;
        }
        case SMB_FIND_FILE_POSIX_INFO:
        {
                struct smb2_posix_info *posix_info;

                posix_info = (struct smb2_posix_info *)d_info->wptr;
                memcpy(posix_info->name, d_info->name, d_info->name_len);
                posix_info->name[d_info->name_len] = 0x00;
                posix_info->name_len = cpu_to_le32(d_info->name_len);
                posix_info->NextEntryOffset =
                        cpu_to_le32(next_entry_offset);
                break;
        }
        } /* switch (info_level) */

        d_info->num_entry++;
        d_info->out_buf_len -= next_entry_offset;
        d_info->wptr += next_entry_offset;
        return 0;
}

static int __query_dir(struct dir_context *ctx, const char *name, int namlen,
                       loff_t offset, u64 ino, unsigned int d_type)
{
        struct ksmbd_readdir_data       *buf;
        struct smb2_query_dir_private   *priv;
        struct ksmbd_dir_info           *d_info;
        int                             rc;

        buf     = container_of(ctx, struct ksmbd_readdir_data, ctx);
        priv    = buf->private;
        d_info  = priv->d_info;

        /* dot and dotdot entries are already reserved */
        if (!strcmp(".", name) || !strcmp("..", name))
                return 0;
        if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
                return 0;
        if (!match_pattern(name, namlen, priv->search_pattern))
                return 0;

        d_info->name            = name;
        d_info->name_len        = namlen;
        rc = reserve_populate_dentry(d_info, priv->info_level);
        if (rc)
                return rc;
        if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
                d_info->out_buf_len = 0;
                return 0;
        }
        return 0;
}

static void restart_ctx(struct dir_context *ctx)
{
        ctx->pos = 0;
}

static int verify_info_level(int info_level)
{
        switch (info_level) {
        case FILE_FULL_DIRECTORY_INFORMATION:
        case FILE_BOTH_DIRECTORY_INFORMATION:
        case FILE_DIRECTORY_INFORMATION:
        case FILE_NAMES_INFORMATION:
        case FILEID_FULL_DIRECTORY_INFORMATION:
        case FILEID_BOTH_DIRECTORY_INFORMATION:
        case SMB_FIND_FILE_POSIX_INFO:
                break;
        default:
                return -EOPNOTSUPP;
        }

        return 0;
}

static int smb2_calc_max_out_buf_len(struct ksmbd_work *work,
                                     unsigned short hdr2_len,
                                     unsigned int out_buf_len)
{
        int free_len;

        if (out_buf_len > work->conn->vals->max_trans_size)
                return -EINVAL;

        free_len = (int)(work->response_sz -
                         (get_rfc1002_len(work->response_buf) + 4)) -
                hdr2_len;
        if (free_len < 0)
                return -EINVAL;

        return min_t(int, out_buf_len, free_len);
}

int smb2_query_dir(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_query_directory_req *req;
        struct smb2_query_directory_rsp *rsp, *rsp_org;
        struct ksmbd_share_config *share = work->tcon->share_conf;
        struct ksmbd_file *dir_fp = NULL;
        struct ksmbd_dir_info d_info;
        int rc = 0;
        char *srch_ptr = NULL;
        unsigned char srch_flag;
        int buffer_sz;
        struct smb2_query_dir_private query_dir_private = {NULL, };

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        if (ksmbd_override_fsids(work)) {
                rsp->hdr.Status = STATUS_NO_MEMORY;
                smb2_set_err_rsp(work);
                return -ENOMEM;
        }

        rc = verify_info_level(req->FileInformationClass);
        if (rc) {
                rc = -EFAULT;
                goto err_out2;
        }

        dir_fp = ksmbd_lookup_fd_slow(work,
                                      le64_to_cpu(req->VolatileFileId),
                                      le64_to_cpu(req->PersistentFileId));
        if (!dir_fp) {
                rc = -EBADF;
                goto err_out2;
        }

        if (!(dir_fp->daccess & FILE_LIST_DIRECTORY_LE) ||
            inode_permission(file_mnt_user_ns(dir_fp->filp),
                             file_inode(dir_fp->filp),
                             MAY_READ | MAY_EXEC)) {
                pr_err("no right to enumerate directory (%pd)\n",
                       dir_fp->filp->f_path.dentry);
                rc = -EACCES;
                goto err_out2;
        }

        if (!S_ISDIR(file_inode(dir_fp->filp)->i_mode)) {
                pr_err("can't do query dir for a file\n");
                rc = -EINVAL;
                goto err_out2;
        }

        srch_flag = req->Flags;
        srch_ptr = smb_strndup_from_utf16(req->Buffer,
                                          le16_to_cpu(req->FileNameLength), 1,
                                          conn->local_nls);
        if (IS_ERR(srch_ptr)) {
                ksmbd_debug(SMB, "Search Pattern not found\n");
                rc = -EINVAL;
                goto err_out2;
        } else {
                ksmbd_debug(SMB, "Search pattern is %s\n", srch_ptr);
        }

        ksmbd_debug(SMB, "Directory name is %s\n", dir_fp->filename);

        if (srch_flag & SMB2_REOPEN || srch_flag & SMB2_RESTART_SCANS) {
                ksmbd_debug(SMB, "Restart directory scan\n");
                generic_file_llseek(dir_fp->filp, 0, SEEK_SET);
                restart_ctx(&dir_fp->readdir_data.ctx);
        }

        memset(&d_info, 0, sizeof(struct ksmbd_dir_info));
        d_info.wptr = (char *)rsp->Buffer;
        d_info.rptr = (char *)rsp->Buffer;
        d_info.out_buf_len =
                smb2_calc_max_out_buf_len(work, 8,
                                          le32_to_cpu(req->OutputBufferLength));
        if (d_info.out_buf_len < 0) {
                rc = -EINVAL;
                goto err_out;
        }
        d_info.flags = srch_flag;

        /*
         * reserve dot and dotdot entries in head of buffer
         * in first response
         */
        rc = ksmbd_populate_dot_dotdot_entries(work, req->FileInformationClass,
                                               dir_fp, &d_info, srch_ptr,
                                               smb2_populate_readdir_entry);
        if (rc == -ENOSPC)
                rc = 0;
        else if (rc)
                goto err_out;

        if (test_share_config_flag(share, KSMBD_SHARE_FLAG_HIDE_DOT_FILES))
                d_info.hide_dot_file = true;

        buffer_sz                               = d_info.out_buf_len;
        d_info.rptr                             = d_info.wptr;
        query_dir_private.work                  = work;
        query_dir_private.search_pattern        = srch_ptr;
        query_dir_private.dir_fp                = dir_fp;
        query_dir_private.d_info                = &d_info;
        query_dir_private.info_level            = req->FileInformationClass;
        dir_fp->readdir_data.private            = &query_dir_private;
        set_ctx_actor(&dir_fp->readdir_data.ctx, __query_dir);

        rc = iterate_dir(dir_fp->filp, &dir_fp->readdir_data.ctx);
        if (rc == 0)
                restart_ctx(&dir_fp->readdir_data.ctx);
        if (rc == -ENOSPC)
                rc = 0;
        if (rc)
                goto err_out;

        d_info.wptr = d_info.rptr;
        d_info.out_buf_len = buffer_sz;
        rc = process_query_dir_entries(&query_dir_private);
        if (rc)
                goto err_out;

        if (!d_info.data_count && d_info.out_buf_len >= 0) {
                if (srch_flag & SMB2_RETURN_SINGLE_ENTRY && !is_asterisk(srch_ptr)) {
                        rsp->hdr.Status = STATUS_NO_SUCH_FILE;
                } else {
                        dir_fp->dot_dotdot[0] = dir_fp->dot_dotdot[1] = 0;
                        rsp->hdr.Status = STATUS_NO_MORE_FILES;
                }
                rsp->StructureSize = cpu_to_le16(9);
                rsp->OutputBufferOffset = cpu_to_le16(0);
                rsp->OutputBufferLength = cpu_to_le32(0);
                rsp->Buffer[0] = 0;
                inc_rfc1001_len(rsp_org, 9);
        } else {
                ((struct file_directory_info *)
                ((char *)rsp->Buffer + d_info.last_entry_offset))
                ->NextEntryOffset = 0;

                rsp->StructureSize = cpu_to_le16(9);
                rsp->OutputBufferOffset = cpu_to_le16(72);
                rsp->OutputBufferLength = cpu_to_le32(d_info.data_count);
                inc_rfc1001_len(rsp_org, 8 + d_info.data_count);
        }

        kfree(srch_ptr);
        ksmbd_fd_put(work, dir_fp);
        ksmbd_revert_fsids(work);
        return 0;

err_out:
        pr_err("error while processing smb2 query dir rc = %d\n", rc);
        kfree(srch_ptr);

err_out2:
        if (rc == -EINVAL)
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
        else if (rc == -EACCES)
                rsp->hdr.Status = STATUS_ACCESS_DENIED;
        else if (rc == -ENOENT)
                rsp->hdr.Status = STATUS_NO_SUCH_FILE;
        else if (rc == -EBADF)
                rsp->hdr.Status = STATUS_FILE_CLOSED;
        else if (rc == -ENOMEM)
                rsp->hdr.Status = STATUS_NO_MEMORY;
        else if (rc == -EFAULT)
                rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
        if (!rsp->hdr.Status)
                rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;

        smb2_set_err_rsp(work);
        ksmbd_fd_put(work, dir_fp);
        ksmbd_revert_fsids(work);
        return 0;
}

/**
 * buffer_check_err() - helper function to check buffer errors
 * @reqOutputBufferLength:      max buffer length expected in command response
 * @rsp:                query info response buffer contains output buffer length
 * @infoclass_size:     query info class response buffer size
 *
 * Return:      0 on success, otherwise error
 */
static int buffer_check_err(int reqOutputBufferLength,
                            struct smb2_query_info_rsp *rsp, int infoclass_size)
{
        if (reqOutputBufferLength < le32_to_cpu(rsp->OutputBufferLength)) {
                if (reqOutputBufferLength < infoclass_size) {
                        pr_err("Invalid Buffer Size Requested\n");
                        rsp->hdr.Status = STATUS_INFO_LENGTH_MISMATCH;
                        rsp->hdr.smb2_buf_length = cpu_to_be32(sizeof(struct smb2_hdr) - 4);
                        return -EINVAL;
                }

                ksmbd_debug(SMB, "Buffer Overflow\n");
                rsp->hdr.Status = STATUS_BUFFER_OVERFLOW;
                rsp->hdr.smb2_buf_length = cpu_to_be32(sizeof(struct smb2_hdr) - 4 +
                                reqOutputBufferLength);
                rsp->OutputBufferLength = cpu_to_le32(reqOutputBufferLength);
        }
        return 0;
}

static void get_standard_info_pipe(struct smb2_query_info_rsp *rsp)
{
        struct smb2_file_standard_info *sinfo;

        sinfo = (struct smb2_file_standard_info *)rsp->Buffer;

        sinfo->AllocationSize = cpu_to_le64(4096);
        sinfo->EndOfFile = cpu_to_le64(0);
        sinfo->NumberOfLinks = cpu_to_le32(1);
        sinfo->DeletePending = 1;
        sinfo->Directory = 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_standard_info));
        inc_rfc1001_len(rsp, sizeof(struct smb2_file_standard_info));
}

static void get_internal_info_pipe(struct smb2_query_info_rsp *rsp, u64 num)
{
        struct smb2_file_internal_info *file_info;

        file_info = (struct smb2_file_internal_info *)rsp->Buffer;

        /* any unique number */
        file_info->IndexNumber = cpu_to_le64(num | (1ULL << 63));
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_internal_info));
        inc_rfc1001_len(rsp, sizeof(struct smb2_file_internal_info));
}

static int smb2_get_info_file_pipe(struct ksmbd_session *sess,
                                   struct smb2_query_info_req *req,
                                   struct smb2_query_info_rsp *rsp)
{
        u64 id;
        int rc;

        /*
         * Windows can sometime send query file info request on
         * pipe without opening it, checking error condition here
         */
        id = le64_to_cpu(req->VolatileFileId);
        if (!ksmbd_session_rpc_method(sess, id))
                return -ENOENT;

        ksmbd_debug(SMB, "FileInfoClass %u, FileId 0x%llx\n",
                    req->FileInfoClass, le64_to_cpu(req->VolatileFileId));

        switch (req->FileInfoClass) {
        case FILE_STANDARD_INFORMATION:
                get_standard_info_pipe(rsp);
                rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
                                      rsp, FILE_STANDARD_INFORMATION_SIZE);
                break;
        case FILE_INTERNAL_INFORMATION:
                get_internal_info_pipe(rsp, id);
                rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
                                      rsp, FILE_INTERNAL_INFORMATION_SIZE);
                break;
        default:
                ksmbd_debug(SMB, "smb2_info_file_pipe for %u not supported\n",
                            req->FileInfoClass);
                rc = -EOPNOTSUPP;
        }
        return rc;
}

/**
 * smb2_get_ea() - handler for smb2 get extended attribute command
 * @work:       smb work containing query info command buffer
 * @fp:         ksmbd_file pointer
 * @req:        get extended attribute request
 * @rsp:        response buffer pointer
 * @rsp_org:    base response buffer pointer in case of chained response
 *
 * Return:      0 on success, otherwise error
 */
static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp,
                       struct smb2_query_info_req *req,
                       struct smb2_query_info_rsp *rsp, void *rsp_org)
{
        struct smb2_ea_info *eainfo, *prev_eainfo;
        char *name, *ptr, *xattr_list = NULL, *buf;
        int rc, name_len, value_len, xattr_list_len, idx;
        ssize_t buf_free_len, alignment_bytes, next_offset, rsp_data_cnt = 0;
        struct smb2_ea_info_req *ea_req = NULL;
        struct path *path;
        struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);

        if (!(fp->daccess & FILE_READ_EA_LE)) {
                pr_err("Not permitted to read ext attr : 0x%x\n",
                       fp->daccess);
                return -EACCES;
        }

        path = &fp->filp->f_path;
        /* single EA entry is requested with given user.* name */
        if (req->InputBufferLength) {
                if (le32_to_cpu(req->InputBufferLength) <
                    sizeof(struct smb2_ea_info_req))
                        return -EINVAL;

                ea_req = (struct smb2_ea_info_req *)req->Buffer;
        } else {
                /* need to send all EAs, if no specific EA is requested*/
                if (le32_to_cpu(req->Flags) & SL_RETURN_SINGLE_ENTRY)
                        ksmbd_debug(SMB,
                                    "All EAs are requested but need to send single EA entry in rsp flags 0x%x\n",
                                    le32_to_cpu(req->Flags));
        }

        buf_free_len =
                smb2_calc_max_out_buf_len(work, 8,
                                          le32_to_cpu(req->OutputBufferLength));
        if (buf_free_len < 0)
                return -EINVAL;

        rc = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
        if (rc < 0) {
                rsp->hdr.Status = STATUS_INVALID_HANDLE;
                goto out;
        } else if (!rc) { /* there is no EA in the file */
                ksmbd_debug(SMB, "no ea data in the file\n");
                goto done;
        }
        xattr_list_len = rc;

        ptr = (char *)rsp->Buffer;
        eainfo = (struct smb2_ea_info *)ptr;
        prev_eainfo = eainfo;
        idx = 0;

        while (idx < xattr_list_len) {
                name = xattr_list + idx;
                name_len = strlen(name);

                ksmbd_debug(SMB, "%s, len %d\n", name, name_len);
                idx += name_len + 1;

                /*
                 * CIFS does not support EA other than user.* namespace,
                 * still keep the framework generic, to list other attrs
                 * in future.
                 */
                if (strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
                        continue;

                if (!strncmp(&name[XATTR_USER_PREFIX_LEN], STREAM_PREFIX,
                             STREAM_PREFIX_LEN))
                        continue;

                if (req->InputBufferLength &&
                    strncmp(&name[XATTR_USER_PREFIX_LEN], ea_req->name,
                            ea_req->EaNameLength))
                        continue;

                if (!strncmp(&name[XATTR_USER_PREFIX_LEN],
                             DOS_ATTRIBUTE_PREFIX, DOS_ATTRIBUTE_PREFIX_LEN))
                        continue;

                if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
                        name_len -= XATTR_USER_PREFIX_LEN;

                ptr = (char *)(&eainfo->name + name_len + 1);
                buf_free_len -= (offsetof(struct smb2_ea_info, name) +
                                name_len + 1);
                /* bailout if xattr can't fit in buf_free_len */
                value_len = ksmbd_vfs_getxattr(user_ns, path->dentry,
                                               name, &buf);
                if (value_len <= 0) {
                        rc = -ENOENT;
                        rsp->hdr.Status = STATUS_INVALID_HANDLE;
                        goto out;
                }

                buf_free_len -= value_len;
                if (buf_free_len < 0) {
                        kfree(buf);
                        break;
                }

                memcpy(ptr, buf, value_len);
                kfree(buf);

                ptr += value_len;
                eainfo->Flags = 0;
                eainfo->EaNameLength = name_len;

                if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
                        memcpy(eainfo->name, &name[XATTR_USER_PREFIX_LEN],
                               name_len);
                else
                        memcpy(eainfo->name, name, name_len);

                eainfo->name[name_len] = '\0';
                eainfo->EaValueLength = cpu_to_le16(value_len);
                next_offset = offsetof(struct smb2_ea_info, name) +
                        name_len + 1 + value_len;

                /* align next xattr entry at 4 byte bundary */
                alignment_bytes = ((next_offset + 3) & ~3) - next_offset;
                if (alignment_bytes) {
                        memset(ptr, '\0', alignment_bytes);
                        ptr += alignment_bytes;
                        next_offset += alignment_bytes;
                        buf_free_len -= alignment_bytes;
                }
                eainfo->NextEntryOffset = cpu_to_le32(next_offset);
                prev_eainfo = eainfo;
                eainfo = (struct smb2_ea_info *)ptr;
                rsp_data_cnt += next_offset;

                if (req->InputBufferLength) {
                        ksmbd_debug(SMB, "single entry requested\n");
                        break;
                }
        }

        /* no more ea entries */
        prev_eainfo->NextEntryOffset = 0;
done:
        rc = 0;
        if (rsp_data_cnt == 0)
                rsp->hdr.Status = STATUS_NO_EAS_ON_FILE;
        rsp->OutputBufferLength = cpu_to_le32(rsp_data_cnt);
        inc_rfc1001_len(rsp_org, rsp_data_cnt);
out:
        kvfree(xattr_list);
        return rc;
}

static void get_file_access_info(struct smb2_query_info_rsp *rsp,
                                 struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_access_info *file_info;

        file_info = (struct smb2_file_access_info *)rsp->Buffer;
        file_info->AccessFlags = fp->daccess;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_access_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_access_info));
}

static int get_file_basic_info(struct smb2_query_info_rsp *rsp,
                               struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_basic_info *basic_info;
        struct kstat stat;
        u64 time;

        if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
                pr_err("no right to read the attributes : 0x%x\n",
                       fp->daccess);
                return -EACCES;
        }

        basic_info = (struct smb2_file_basic_info *)rsp->Buffer;
        generic_fillattr(file_mnt_user_ns(fp->filp), file_inode(fp->filp),
                         &stat);
        basic_info->CreationTime = cpu_to_le64(fp->create_time);
        time = ksmbd_UnixTimeToNT(stat.atime);
        basic_info->LastAccessTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.mtime);
        basic_info->LastWriteTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.ctime);
        basic_info->ChangeTime = cpu_to_le64(time);
        basic_info->Attributes = fp->f_ci->m_fattr;
        basic_info->Pad1 = 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_basic_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_basic_info));
        return 0;
}

static unsigned long long get_allocation_size(struct inode *inode,
                                              struct kstat *stat)
{
        unsigned long long alloc_size = 0;

        if (!S_ISDIR(stat->mode)) {
                if ((inode->i_blocks << 9) <= stat->size)
                        alloc_size = stat->size;
                else
                        alloc_size = inode->i_blocks << 9;
        }

        return alloc_size;
}

static void get_file_standard_info(struct smb2_query_info_rsp *rsp,
                                   struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_standard_info *sinfo;
        unsigned int delete_pending;
        struct inode *inode;
        struct kstat stat;

        inode = file_inode(fp->filp);
        generic_fillattr(file_mnt_user_ns(fp->filp), inode, &stat);

        sinfo = (struct smb2_file_standard_info *)rsp->Buffer;
        delete_pending = ksmbd_inode_pending_delete(fp);

        sinfo->AllocationSize = cpu_to_le64(get_allocation_size(inode, &stat));
        sinfo->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
        sinfo->NumberOfLinks = cpu_to_le32(get_nlink(&stat) - delete_pending);
        sinfo->DeletePending = delete_pending;
        sinfo->Directory = S_ISDIR(stat.mode) ? 1 : 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_standard_info));
        inc_rfc1001_len(rsp_org,
                        sizeof(struct smb2_file_standard_info));
}

static void get_file_alignment_info(struct smb2_query_info_rsp *rsp,
                                    void *rsp_org)
{
        struct smb2_file_alignment_info *file_info;

        file_info = (struct smb2_file_alignment_info *)rsp->Buffer;
        file_info->AlignmentRequirement = 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_alignment_info));
        inc_rfc1001_len(rsp_org,
                        sizeof(struct smb2_file_alignment_info));
}

static int get_file_all_info(struct ksmbd_work *work,
                             struct smb2_query_info_rsp *rsp,
                             struct ksmbd_file *fp,
                             void *rsp_org)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_file_all_info *file_info;
        unsigned int delete_pending;
        struct inode *inode;
        struct kstat stat;
        int conv_len;
        char *filename;
        u64 time;

        if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
                ksmbd_debug(SMB, "no right to read the attributes : 0x%x\n",
                            fp->daccess);
                return -EACCES;
        }

        filename = convert_to_nt_pathname(fp->filename);
        if (!filename)
                return -ENOMEM;

        inode = file_inode(fp->filp);
        generic_fillattr(file_mnt_user_ns(fp->filp), inode, &stat);

        ksmbd_debug(SMB, "filename = %s\n", filename);
        delete_pending = ksmbd_inode_pending_delete(fp);
        file_info = (struct smb2_file_all_info *)rsp->Buffer;

        file_info->CreationTime = cpu_to_le64(fp->create_time);
        time = ksmbd_UnixTimeToNT(stat.atime);
        file_info->LastAccessTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.mtime);
        file_info->LastWriteTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.ctime);
        file_info->ChangeTime = cpu_to_le64(time);
        file_info->Attributes = fp->f_ci->m_fattr;
        file_info->Pad1 = 0;
        file_info->AllocationSize =
                cpu_to_le64(get_allocation_size(inode, &stat));
        file_info->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
        file_info->NumberOfLinks =
                        cpu_to_le32(get_nlink(&stat) - delete_pending);
        file_info->DeletePending = delete_pending;
        file_info->Directory = S_ISDIR(stat.mode) ? 1 : 0;
        file_info->Pad2 = 0;
        file_info->IndexNumber = cpu_to_le64(stat.ino);
        file_info->EASize = 0;
        file_info->AccessFlags = fp->daccess;
        file_info->CurrentByteOffset = cpu_to_le64(fp->filp->f_pos);
        file_info->Mode = fp->coption;
        file_info->AlignmentRequirement = 0;
        conv_len = smbConvertToUTF16((__le16 *)file_info->FileName, filename,
                                     PATH_MAX, conn->local_nls, 0);
        conv_len *= 2;
        file_info->FileNameLength = cpu_to_le32(conv_len);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_all_info) + conv_len - 1);
        kfree(filename);
        inc_rfc1001_len(rsp_org, le32_to_cpu(rsp->OutputBufferLength));
        return 0;
}

static void get_file_alternate_info(struct ksmbd_work *work,
                                    struct smb2_query_info_rsp *rsp,
                                    struct ksmbd_file *fp,
                                    void *rsp_org)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_file_alt_name_info *file_info;
        struct dentry *dentry = fp->filp->f_path.dentry;
        int conv_len;

        spin_lock(&dentry->d_lock);
        file_info = (struct smb2_file_alt_name_info *)rsp->Buffer;
        conv_len = ksmbd_extract_shortname(conn,
                                           dentry->d_name.name,
                                           file_info->FileName);
        spin_unlock(&dentry->d_lock);
        file_info->FileNameLength = cpu_to_le32(conv_len);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_alt_name_info) + conv_len);
        inc_rfc1001_len(rsp_org, le32_to_cpu(rsp->OutputBufferLength));
}

static void get_file_stream_info(struct ksmbd_work *work,
                                 struct smb2_query_info_rsp *rsp,
                                 struct ksmbd_file *fp,
                                 void *rsp_org)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_file_stream_info *file_info;
        char *stream_name, *xattr_list = NULL, *stream_buf;
        struct kstat stat;
        struct path *path = &fp->filp->f_path;
        ssize_t xattr_list_len;
        int nbytes = 0, streamlen, stream_name_len, next, idx = 0;
        int buf_free_len;
        struct smb2_query_info_req *req = ksmbd_req_buf_next(work);

        generic_fillattr(file_mnt_user_ns(fp->filp), file_inode(fp->filp),
                         &stat);
        file_info = (struct smb2_file_stream_info *)rsp->Buffer;

        buf_free_len =
                smb2_calc_max_out_buf_len(work, 8,
                                          le32_to_cpu(req->OutputBufferLength));
        if (buf_free_len < 0)
                goto out;

        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;
        }

        while (idx < xattr_list_len) {
                stream_name = xattr_list + idx;
                streamlen = strlen(stream_name);
                idx += streamlen + 1;

                ksmbd_debug(SMB, "%s, len %d\n", stream_name, streamlen);

                if (strncmp(&stream_name[XATTR_USER_PREFIX_LEN],
                            STREAM_PREFIX, STREAM_PREFIX_LEN))
                        continue;

                stream_name_len = streamlen - (XATTR_USER_PREFIX_LEN +
                                STREAM_PREFIX_LEN);
                streamlen = stream_name_len;

                /* plus : size */
                streamlen += 1;
                stream_buf = kmalloc(streamlen + 1, GFP_KERNEL);
                if (!stream_buf)
                        break;

                streamlen = snprintf(stream_buf, streamlen + 1,
                                     ":%s", &stream_name[XATTR_NAME_STREAM_LEN]);

                next = sizeof(struct smb2_file_stream_info) + streamlen * 2;
                if (next > buf_free_len) {
                        kfree(stream_buf);
                        break;
                }

                file_info = (struct smb2_file_stream_info *)&rsp->Buffer[nbytes];
                streamlen  = smbConvertToUTF16((__le16 *)file_info->StreamName,
                                               stream_buf, streamlen,
                                               conn->local_nls, 0);
                streamlen *= 2;
                kfree(stream_buf);
                file_info->StreamNameLength = cpu_to_le32(streamlen);
                file_info->StreamSize = cpu_to_le64(stream_name_len);
                file_info->StreamAllocationSize = cpu_to_le64(stream_name_len);

                nbytes += next;
                buf_free_len -= next;
                file_info->NextEntryOffset = cpu_to_le32(next);
        }

out:
        if (!S_ISDIR(stat.mode) &&
            buf_free_len >= sizeof(struct smb2_file_stream_info) + 7 * 2) {
                file_info = (struct smb2_file_stream_info *)
                        &rsp->Buffer[nbytes];
                streamlen = smbConvertToUTF16((__le16 *)file_info->StreamName,
                                              "::$DATA", 7, conn->local_nls, 0);
                streamlen *= 2;
                file_info->StreamNameLength = cpu_to_le32(streamlen);
                file_info->StreamSize = cpu_to_le64(stat.size);
                file_info->StreamAllocationSize = cpu_to_le64(stat.blocks << 9);
                nbytes += sizeof(struct smb2_file_stream_info) + streamlen;
        }

        /* last entry offset should be 0 */
        file_info->NextEntryOffset = 0;
        kvfree(xattr_list);

        rsp->OutputBufferLength = cpu_to_le32(nbytes);
        inc_rfc1001_len(rsp_org, nbytes);
}

static void get_file_internal_info(struct smb2_query_info_rsp *rsp,
                                   struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_internal_info *file_info;
        struct kstat stat;

        generic_fillattr(file_mnt_user_ns(fp->filp), file_inode(fp->filp),
                         &stat);
        file_info = (struct smb2_file_internal_info *)rsp->Buffer;
        file_info->IndexNumber = cpu_to_le64(stat.ino);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_internal_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_internal_info));
}

static int get_file_network_open_info(struct smb2_query_info_rsp *rsp,
                                      struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_ntwrk_info *file_info;
        struct inode *inode;
        struct kstat stat;
        u64 time;

        if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
                pr_err("no right to read the attributes : 0x%x\n",
                       fp->daccess);
                return -EACCES;
        }

        file_info = (struct smb2_file_ntwrk_info *)rsp->Buffer;

        inode = file_inode(fp->filp);
        generic_fillattr(file_mnt_user_ns(fp->filp), inode, &stat);

        file_info->CreationTime = cpu_to_le64(fp->create_time);
        time = ksmbd_UnixTimeToNT(stat.atime);
        file_info->LastAccessTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.mtime);
        file_info->LastWriteTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(stat.ctime);
        file_info->ChangeTime = cpu_to_le64(time);
        file_info->Attributes = fp->f_ci->m_fattr;
        file_info->AllocationSize =
                cpu_to_le64(get_allocation_size(inode, &stat));
        file_info->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
        file_info->Reserved = cpu_to_le32(0);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_ntwrk_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_ntwrk_info));
        return 0;
}

static void get_file_ea_info(struct smb2_query_info_rsp *rsp, void *rsp_org)
{
        struct smb2_file_ea_info *file_info;

        file_info = (struct smb2_file_ea_info *)rsp->Buffer;
        file_info->EASize = 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_ea_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_ea_info));
}

static void get_file_position_info(struct smb2_query_info_rsp *rsp,
                                   struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_pos_info *file_info;

        file_info = (struct smb2_file_pos_info *)rsp->Buffer;
        file_info->CurrentByteOffset = cpu_to_le64(fp->filp->f_pos);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_pos_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_pos_info));
}

static void get_file_mode_info(struct smb2_query_info_rsp *rsp,
                               struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_mode_info *file_info;

        file_info = (struct smb2_file_mode_info *)rsp->Buffer;
        file_info->Mode = fp->coption & FILE_MODE_INFO_MASK;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_mode_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_mode_info));
}

static void get_file_compression_info(struct smb2_query_info_rsp *rsp,
                                      struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_comp_info *file_info;
        struct kstat stat;

        generic_fillattr(file_mnt_user_ns(fp->filp), file_inode(fp->filp),
                         &stat);

        file_info = (struct smb2_file_comp_info *)rsp->Buffer;
        file_info->CompressedFileSize = cpu_to_le64(stat.blocks << 9);
        file_info->CompressionFormat = COMPRESSION_FORMAT_NONE;
        file_info->CompressionUnitShift = 0;
        file_info->ChunkShift = 0;
        file_info->ClusterShift = 0;
        memset(&file_info->Reserved[0], 0, 3);

        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_comp_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_comp_info));
}

static int get_file_attribute_tag_info(struct smb2_query_info_rsp *rsp,
                                       struct ksmbd_file *fp, void *rsp_org)
{
        struct smb2_file_attr_tag_info *file_info;

        if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
                pr_err("no right to read the attributes : 0x%x\n",
                       fp->daccess);
                return -EACCES;
        }

        file_info = (struct smb2_file_attr_tag_info *)rsp->Buffer;
        file_info->FileAttributes = fp->f_ci->m_fattr;
        file_info->ReparseTag = 0;
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb2_file_attr_tag_info));
        inc_rfc1001_len(rsp_org, sizeof(struct smb2_file_attr_tag_info));
        return 0;
}

static int find_file_posix_info(struct smb2_query_info_rsp *rsp,
                                struct ksmbd_file *fp, void *rsp_org)
{
        struct smb311_posix_qinfo *file_info;
        struct inode *inode = file_inode(fp->filp);
        u64 time;

        file_info = (struct smb311_posix_qinfo *)rsp->Buffer;
        file_info->CreationTime = cpu_to_le64(fp->create_time);
        time = ksmbd_UnixTimeToNT(inode->i_atime);
        file_info->LastAccessTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(inode->i_mtime);
        file_info->LastWriteTime = cpu_to_le64(time);
        time = ksmbd_UnixTimeToNT(inode->i_ctime);
        file_info->ChangeTime = cpu_to_le64(time);
        file_info->DosAttributes = fp->f_ci->m_fattr;
        file_info->Inode = cpu_to_le64(inode->i_ino);
        file_info->EndOfFile = cpu_to_le64(inode->i_size);
        file_info->AllocationSize = cpu_to_le64(inode->i_blocks << 9);
        file_info->HardLinks = cpu_to_le32(inode->i_nlink);
        file_info->Mode = cpu_to_le32(inode->i_mode);
        file_info->DeviceId = cpu_to_le32(inode->i_rdev);
        rsp->OutputBufferLength =
                cpu_to_le32(sizeof(struct smb311_posix_qinfo));
        inc_rfc1001_len(rsp_org, sizeof(struct smb311_posix_qinfo));
        return 0;
}

static int smb2_get_info_file(struct ksmbd_work *work,
                              struct smb2_query_info_req *req,
                              struct smb2_query_info_rsp *rsp, void *rsp_org)
{
        struct ksmbd_file *fp;
        int fileinfoclass = 0;
        int rc = 0;
        int file_infoclass_size;
        unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;

        if (test_share_config_flag(work->tcon->share_conf,
                                   KSMBD_SHARE_FLAG_PIPE)) {
                /* smb2 info file called for pipe */
                return smb2_get_info_file_pipe(work->sess, req, rsp);
        }

        if (work->next_smb2_rcv_hdr_off) {
                if (!has_file_id(le64_to_cpu(req->VolatileFileId))) {
                        ksmbd_debug(SMB, "Compound request set FID = %llu\n",
                                    work->compound_fid);
                        id = work->compound_fid;
                        pid = work->compound_pfid;
                }
        }

        if (!has_file_id(id)) {
                id = le64_to_cpu(req->VolatileFileId);
                pid = le64_to_cpu(req->PersistentFileId);
        }

        fp = ksmbd_lookup_fd_slow(work, id, pid);
        if (!fp)
                return -ENOENT;

        fileinfoclass = req->FileInfoClass;

        switch (fileinfoclass) {
        case FILE_ACCESS_INFORMATION:
                get_file_access_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_ACCESS_INFORMATION_SIZE;
                break;

        case FILE_BASIC_INFORMATION:
                rc = get_file_basic_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_BASIC_INFORMATION_SIZE;
                break;

        case FILE_STANDARD_INFORMATION:
                get_file_standard_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_STANDARD_INFORMATION_SIZE;
                break;

        case FILE_ALIGNMENT_INFORMATION:
                get_file_alignment_info(rsp, rsp_org);
                file_infoclass_size = FILE_ALIGNMENT_INFORMATION_SIZE;
                break;

        case FILE_ALL_INFORMATION:
                rc = get_file_all_info(work, rsp, fp, rsp_org);
                file_infoclass_size = FILE_ALL_INFORMATION_SIZE;
                break;

        case FILE_ALTERNATE_NAME_INFORMATION:
                get_file_alternate_info(work, rsp, fp, rsp_org);
                file_infoclass_size = FILE_ALTERNATE_NAME_INFORMATION_SIZE;
                break;

        case FILE_STREAM_INFORMATION:
                get_file_stream_info(work, rsp, fp, rsp_org);
                file_infoclass_size = FILE_STREAM_INFORMATION_SIZE;
                break;

        case FILE_INTERNAL_INFORMATION:
                get_file_internal_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_INTERNAL_INFORMATION_SIZE;
                break;

        case FILE_NETWORK_OPEN_INFORMATION:
                rc = get_file_network_open_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_NETWORK_OPEN_INFORMATION_SIZE;
                break;

        case FILE_EA_INFORMATION:
                get_file_ea_info(rsp, rsp_org);
                file_infoclass_size = FILE_EA_INFORMATION_SIZE;
                break;

        case FILE_FULL_EA_INFORMATION:
                rc = smb2_get_ea(work, fp, req, rsp, rsp_org);
                file_infoclass_size = FILE_FULL_EA_INFORMATION_SIZE;
                break;

        case FILE_POSITION_INFORMATION:
                get_file_position_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_POSITION_INFORMATION_SIZE;
                break;

        case FILE_MODE_INFORMATION:
                get_file_mode_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_MODE_INFORMATION_SIZE;
                break;

        case FILE_COMPRESSION_INFORMATION:
                get_file_compression_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_COMPRESSION_INFORMATION_SIZE;
                break;

        case FILE_ATTRIBUTE_TAG_INFORMATION:
                rc = get_file_attribute_tag_info(rsp, fp, rsp_org);
                file_infoclass_size = FILE_ATTRIBUTE_TAG_INFORMATION_SIZE;
                break;
        case SMB_FIND_FILE_POSIX_INFO:
                if (!work->tcon->posix_extensions) {
                        pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
                        rc = -EOPNOTSUPP;
                } else {
                        rc = find_file_posix_info(rsp, fp, rsp_org);
                        file_infoclass_size = sizeof(struct smb311_posix_qinfo);
                }
                break;
        default:
                ksmbd_debug(SMB, "fileinfoclass %d not supported yet\n",
                            fileinfoclass);
                rc = -EOPNOTSUPP;
        }
        if (!rc)
                rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
                                      rsp,
                                      file_infoclass_size);
        ksmbd_fd_put(work, fp);
        return rc;
}

static int smb2_get_info_filesystem(struct ksmbd_work *work,
                                    struct smb2_query_info_req *req,
                                    struct smb2_query_info_rsp *rsp, void *rsp_org)
{
        struct ksmbd_session *sess = work->sess;
        struct ksmbd_conn *conn = sess->conn;
        struct ksmbd_share_config *share = work->tcon->share_conf;
        int fsinfoclass = 0;
        struct kstatfs stfs;
        struct path path;
        int rc = 0, len;
        int fs_infoclass_size = 0;

        rc = kern_path(share->path, LOOKUP_NO_SYMLINKS, &path);
        if (rc) {
                pr_err("cannot create vfs path\n");
                return -EIO;
        }

        rc = vfs_statfs(&path, &stfs);
        if (rc) {
                pr_err("cannot do stat of path %s\n", share->path);
                path_put(&path);
                return -EIO;
        }

        fsinfoclass = req->FileInfoClass;

        switch (fsinfoclass) {
        case FS_DEVICE_INFORMATION:
        {
                struct filesystem_device_info *info;

                info = (struct filesystem_device_info *)rsp->Buffer;

                info->DeviceType = cpu_to_le32(stfs.f_type);
                info->DeviceCharacteristics = cpu_to_le32(0x00000020);
                rsp->OutputBufferLength = cpu_to_le32(8);
                inc_rfc1001_len(rsp_org, 8);
                fs_infoclass_size = FS_DEVICE_INFORMATION_SIZE;
                break;
        }
        case FS_ATTRIBUTE_INFORMATION:
        {
                struct filesystem_attribute_info *info;
                size_t sz;

                info = (struct filesystem_attribute_info *)rsp->Buffer;
                info->Attributes = cpu_to_le32(FILE_SUPPORTS_OBJECT_IDS |
                                               FILE_PERSISTENT_ACLS |
                                               FILE_UNICODE_ON_DISK |
                                               FILE_CASE_PRESERVED_NAMES |
                                               FILE_CASE_SENSITIVE_SEARCH |
                                               FILE_SUPPORTS_BLOCK_REFCOUNTING);

                info->Attributes |= cpu_to_le32(server_conf.share_fake_fscaps);

                info->MaxPathNameComponentLength = cpu_to_le32(stfs.f_namelen);
                len = smbConvertToUTF16((__le16 *)info->FileSystemName,
                                        "NTFS", PATH_MAX, conn->local_nls, 0);
                len = len * 2;
                info->FileSystemNameLen = cpu_to_le32(len);
                sz = sizeof(struct filesystem_attribute_info) - 2 + len;
                rsp->OutputBufferLength = cpu_to_le32(sz);
                inc_rfc1001_len(rsp_org, sz);
                fs_infoclass_size = FS_ATTRIBUTE_INFORMATION_SIZE;
                break;
        }
        case FS_VOLUME_INFORMATION:
        {
                struct filesystem_vol_info *info;
                size_t sz;
                unsigned int serial_crc = 0;

                info = (struct filesystem_vol_info *)(rsp->Buffer);
                info->VolumeCreationTime = 0;
                serial_crc = crc32_le(serial_crc, share->name,
                                      strlen(share->name));
                serial_crc = crc32_le(serial_crc, share->path,
                                      strlen(share->path));
                serial_crc = crc32_le(serial_crc, ksmbd_netbios_name(),
                                      strlen(ksmbd_netbios_name()));
                /* Taking dummy value of serial number*/
                info->SerialNumber = cpu_to_le32(serial_crc);
                len = smbConvertToUTF16((__le16 *)info->VolumeLabel,
                                        share->name, PATH_MAX,
                                        conn->local_nls, 0);
                len = len * 2;
                info->VolumeLabelSize = cpu_to_le32(len);
                info->Reserved = 0;
                sz = sizeof(struct filesystem_vol_info) - 2 + len;
                rsp->OutputBufferLength = cpu_to_le32(sz);
                inc_rfc1001_len(rsp_org, sz);
                fs_infoclass_size = FS_VOLUME_INFORMATION_SIZE;
                break;
        }
        case FS_SIZE_INFORMATION:
        {
                struct filesystem_info *info;

                info = (struct filesystem_info *)(rsp->Buffer);
                info->TotalAllocationUnits = cpu_to_le64(stfs.f_blocks);
                info->FreeAllocationUnits = cpu_to_le64(stfs.f_bfree);
                info->SectorsPerAllocationUnit = cpu_to_le32(1);
                info->BytesPerSector = cpu_to_le32(stfs.f_bsize);
                rsp->OutputBufferLength = cpu_to_le32(24);
                inc_rfc1001_len(rsp_org, 24);
                fs_infoclass_size = FS_SIZE_INFORMATION_SIZE;
                break;
        }
        case FS_FULL_SIZE_INFORMATION:
        {
                struct smb2_fs_full_size_info *info;

                info = (struct smb2_fs_full_size_info *)(rsp->Buffer);
                info->TotalAllocationUnits = cpu_to_le64(stfs.f_blocks);
                info->CallerAvailableAllocationUnits =
                                        cpu_to_le64(stfs.f_bavail);
                info->ActualAvailableAllocationUnits =
                                        cpu_to_le64(stfs.f_bfree);
                info->SectorsPerAllocationUnit = cpu_to_le32(1);
                info->BytesPerSector = cpu_to_le32(stfs.f_bsize);
                rsp->OutputBufferLength = cpu_to_le32(32);
                inc_rfc1001_len(rsp_org, 32);
                fs_infoclass_size = FS_FULL_SIZE_INFORMATION_SIZE;
                break;
        }
        case FS_OBJECT_ID_INFORMATION:
        {
                struct object_id_info *info;

                info = (struct object_id_info *)(rsp->Buffer);

                if (!user_guest(sess->user))
                        memcpy(info->objid, user_passkey(sess->user), 16);
                else
                        memset(info->objid, 0, 16);

                info->extended_info.magic = cpu_to_le32(EXTENDED_INFO_MAGIC);
                info->extended_info.version = cpu_to_le32(1);
                info->extended_info.release = cpu_to_le32(1);
                info->extended_info.rel_date = 0;
                memcpy(info->extended_info.version_string, "1.1.0", strlen("1.1.0"));
                rsp->OutputBufferLength = cpu_to_le32(64);
                inc_rfc1001_len(rsp_org, 64);
                fs_infoclass_size = FS_OBJECT_ID_INFORMATION_SIZE;
                break;
        }
        case FS_SECTOR_SIZE_INFORMATION:
        {
                struct smb3_fs_ss_info *info;

                info = (struct smb3_fs_ss_info *)(rsp->Buffer);

                info->LogicalBytesPerSector = cpu_to_le32(stfs.f_bsize);
                info->PhysicalBytesPerSectorForAtomicity =
                                cpu_to_le32(stfs.f_bsize);
                info->PhysicalBytesPerSectorForPerf = cpu_to_le32(stfs.f_bsize);
                info->FSEffPhysicalBytesPerSectorForAtomicity =
                                cpu_to_le32(stfs.f_bsize);
                info->Flags = cpu_to_le32(SSINFO_FLAGS_ALIGNED_DEVICE |
                                    SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE);
                info->ByteOffsetForSectorAlignment = 0;
                info->ByteOffsetForPartitionAlignment = 0;
                rsp->OutputBufferLength = cpu_to_le32(28);
                inc_rfc1001_len(rsp_org, 28);
                fs_infoclass_size = FS_SECTOR_SIZE_INFORMATION_SIZE;
                break;
        }
        case FS_CONTROL_INFORMATION:
        {
                /*
                 * TODO : The current implementation is based on
                 * test result with win7(NTFS) server. It's need to
                 * modify this to get valid Quota values
                 * from Linux kernel
                 */
                struct smb2_fs_control_info *info;

                info = (struct smb2_fs_control_info *)(rsp->Buffer);
                info->FreeSpaceStartFiltering = 0;
                info->FreeSpaceThreshold = 0;
                info->FreeSpaceStopFiltering = 0;
                info->DefaultQuotaThreshold = cpu_to_le64(SMB2_NO_FID);
                info->DefaultQuotaLimit = cpu_to_le64(SMB2_NO_FID);
                info->Padding = 0;
                rsp->OutputBufferLength = cpu_to_le32(48);
                inc_rfc1001_len(rsp_org, 48);
                fs_infoclass_size = FS_CONTROL_INFORMATION_SIZE;
                break;
        }
        case FS_POSIX_INFORMATION:
        {
                struct filesystem_posix_info *info;

                if (!work->tcon->posix_extensions) {
                        pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
                        rc = -EOPNOTSUPP;
                } else {
                        info = (struct filesystem_posix_info *)(rsp->Buffer);
                        info->OptimalTransferSize = cpu_to_le32(stfs.f_bsize);
                        info->BlockSize = cpu_to_le32(stfs.f_bsize);
                        info->TotalBlocks = cpu_to_le64(stfs.f_blocks);
                        info->BlocksAvail = cpu_to_le64(stfs.f_bfree);
                        info->UserBlocksAvail = cpu_to_le64(stfs.f_bavail);
                        info->TotalFileNodes = cpu_to_le64(stfs.f_files);
                        info->FreeFileNodes = cpu_to_le64(stfs.f_ffree);
                        rsp->OutputBufferLength = cpu_to_le32(56);
                        inc_rfc1001_len(rsp_org, 56);
                        fs_infoclass_size = FS_POSIX_INFORMATION_SIZE;
                }
                break;
        }
        default:
                path_put(&path);
                return -EOPNOTSUPP;
        }
        rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
                              rsp,
                              fs_infoclass_size);
        path_put(&path);
        return rc;
}

static int smb2_get_info_sec(struct ksmbd_work *work,
                             struct smb2_query_info_req *req,
                             struct smb2_query_info_rsp *rsp, void *rsp_org)
{
        struct ksmbd_file *fp;
        struct user_namespace *user_ns;
        struct smb_ntsd *pntsd = (struct smb_ntsd *)rsp->Buffer, *ppntsd = NULL;
        struct smb_fattr fattr = {{0}};
        struct inode *inode;
        __u32 secdesclen;
        unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;
        int addition_info = le32_to_cpu(req->AdditionalInformation);
        int rc;

        if (addition_info & ~(OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
                              PROTECTED_DACL_SECINFO |
                              UNPROTECTED_DACL_SECINFO)) {
                ksmbd_debug(SMB, "Unsupported addition info: 0x%x)\n",
                       addition_info);

                pntsd->revision = cpu_to_le16(1);
                pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PROTECTED);
                pntsd->osidoffset = 0;
                pntsd->gsidoffset = 0;
                pntsd->sacloffset = 0;
                pntsd->dacloffset = 0;

                secdesclen = sizeof(struct smb_ntsd);
                rsp->OutputBufferLength = cpu_to_le32(secdesclen);
                inc_rfc1001_len(rsp_org, secdesclen);

                return 0;
        }

        if (work->next_smb2_rcv_hdr_off) {
                if (!has_file_id(le64_to_cpu(req->VolatileFileId))) {
                        ksmbd_debug(SMB, "Compound request set FID = %llu\n",
                                    work->compound_fid);
                        id = work->compound_fid;
                        pid = work->compound_pfid;
                }
        }

        if (!has_file_id(id)) {
                id = le64_to_cpu(req->VolatileFileId);
                pid = le64_to_cpu(req->PersistentFileId);
        }

        fp = ksmbd_lookup_fd_slow(work, id, pid);
        if (!fp)
                return -ENOENT;

        user_ns = file_mnt_user_ns(fp->filp);
        inode = file_inode(fp->filp);
        ksmbd_acls_fattr(&fattr, user_ns, inode);

        if (test_share_config_flag(work->tcon->share_conf,
                                   KSMBD_SHARE_FLAG_ACL_XATTR))
                ksmbd_vfs_get_sd_xattr(work->conn, user_ns,
                                       fp->filp->f_path.dentry, &ppntsd);

        rc = build_sec_desc(user_ns, pntsd, ppntsd, addition_info,
                            &secdesclen, &fattr);
        posix_acl_release(fattr.cf_acls);
        posix_acl_release(fattr.cf_dacls);
        kfree(ppntsd);
        ksmbd_fd_put(work, fp);
        if (rc)
                return rc;

        rsp->OutputBufferLength = cpu_to_le32(secdesclen);
        inc_rfc1001_len(rsp_org, secdesclen);
        return 0;
}

/**
 * smb2_query_info() - handler for smb2 query info command
 * @work:       smb work containing query info request buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_query_info(struct ksmbd_work *work)
{
        struct smb2_query_info_req *req;
        struct smb2_query_info_rsp *rsp, *rsp_org;
        int rc = 0;

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        ksmbd_debug(SMB, "GOT query info request\n");

        switch (req->InfoType) {
        case SMB2_O_INFO_FILE:
                ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
                rc = smb2_get_info_file(work, req, rsp, (void *)rsp_org);
                break;
        case SMB2_O_INFO_FILESYSTEM:
                ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILESYSTEM\n");
                rc = smb2_get_info_filesystem(work, req, rsp, (void *)rsp_org);
                break;
        case SMB2_O_INFO_SECURITY:
                ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
                rc = smb2_get_info_sec(work, req, rsp, (void *)rsp_org);
                break;
        default:
                ksmbd_debug(SMB, "InfoType %d not supported yet\n",
                            req->InfoType);
                rc = -EOPNOTSUPP;
        }

        if (rc < 0) {
                if (rc == -EACCES)
                        rsp->hdr.Status = STATUS_ACCESS_DENIED;
                else if (rc == -ENOENT)
                        rsp->hdr.Status = STATUS_FILE_CLOSED;
                else if (rc == -EIO)
                        rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
                else if (rc == -EOPNOTSUPP || rsp->hdr.Status == 0)
                        rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
                smb2_set_err_rsp(work);

                ksmbd_debug(SMB, "error while processing smb2 query rc = %d\n",
                            rc);
                return rc;
        }
        rsp->StructureSize = cpu_to_le16(9);
        rsp->OutputBufferOffset = cpu_to_le16(72);
        inc_rfc1001_len(rsp_org, 8);
        return 0;
}

/**
 * smb2_close_pipe() - handler for closing IPC pipe
 * @work:       smb work containing close request buffer
 *
 * Return:      0
 */
static noinline int smb2_close_pipe(struct ksmbd_work *work)
{
        u64 id;
        struct smb2_close_req *req = work->request_buf;
        struct smb2_close_rsp *rsp = work->response_buf;

        id = le64_to_cpu(req->VolatileFileId);
        ksmbd_session_rpc_close(work->sess, id);

        rsp->StructureSize = cpu_to_le16(60);
        rsp->Flags = 0;
        rsp->Reserved = 0;
        rsp->CreationTime = 0;
        rsp->LastAccessTime = 0;
        rsp->LastWriteTime = 0;
        rsp->ChangeTime = 0;
        rsp->AllocationSize = 0;
        rsp->EndOfFile = 0;
        rsp->Attributes = 0;
        inc_rfc1001_len(rsp, 60);
        return 0;
}

/**
 * smb2_close() - handler for smb2 close file command
 * @work:       smb work containing close request buffer
 *
 * Return:      0
 */
int smb2_close(struct ksmbd_work *work)
{
        u64 volatile_id = KSMBD_NO_FID;
        u64 sess_id;
        struct smb2_close_req *req;
        struct smb2_close_rsp *rsp;
        struct smb2_close_rsp *rsp_org;
        struct ksmbd_conn *conn = work->conn;
        struct ksmbd_file *fp;
        struct inode *inode;
        u64 time;
        int err = 0;

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        if (test_share_config_flag(work->tcon->share_conf,
                                   KSMBD_SHARE_FLAG_PIPE)) {
                ksmbd_debug(SMB, "IPC pipe close request\n");
                return smb2_close_pipe(work);
        }

        sess_id = le64_to_cpu(req->hdr.SessionId);
        if (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)
                sess_id = work->compound_sid;

        work->compound_sid = 0;
        if (check_session_id(conn, sess_id)) {
                work->compound_sid = sess_id;
        } else {
                rsp->hdr.Status = STATUS_USER_SESSION_DELETED;
                if (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                err = -EBADF;
                goto out;
        }

        if (work->next_smb2_rcv_hdr_off &&
            !has_file_id(le64_to_cpu(req->VolatileFileId))) {
                if (!has_file_id(work->compound_fid)) {
                        /* file already closed, return FILE_CLOSED */
                        ksmbd_debug(SMB, "file already closed\n");
                        rsp->hdr.Status = STATUS_FILE_CLOSED;
                        err = -EBADF;
                        goto out;
                } else {
                        ksmbd_debug(SMB,
                                    "Compound request set FID = %llu:%llu\n",
                                    work->compound_fid,
                                    work->compound_pfid);
                        volatile_id = work->compound_fid;

                        /* file closed, stored id is not valid anymore */
                        work->compound_fid = KSMBD_NO_FID;
                        work->compound_pfid = KSMBD_NO_FID;
                }
        } else {
                volatile_id = le64_to_cpu(req->VolatileFileId);
        }
        ksmbd_debug(SMB, "volatile_id = %llu\n", volatile_id);

        rsp->StructureSize = cpu_to_le16(60);
        rsp->Reserved = 0;

        if (req->Flags == SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB) {
                fp = ksmbd_lookup_fd_fast(work, volatile_id);
                if (!fp) {
                        err = -ENOENT;
                        goto out;
                }

                inode = file_inode(fp->filp);
                rsp->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
                rsp->AllocationSize = S_ISDIR(inode->i_mode) ? 0 :
                        cpu_to_le64(inode->i_blocks << 9);
                rsp->EndOfFile = cpu_to_le64(inode->i_size);
                rsp->Attributes = fp->f_ci->m_fattr;
                rsp->CreationTime = cpu_to_le64(fp->create_time);
                time = ksmbd_UnixTimeToNT(inode->i_atime);
                rsp->LastAccessTime = cpu_to_le64(time);
                time = ksmbd_UnixTimeToNT(inode->i_mtime);
                rsp->LastWriteTime = cpu_to_le64(time);
                time = ksmbd_UnixTimeToNT(inode->i_ctime);
                rsp->ChangeTime = cpu_to_le64(time);
                ksmbd_fd_put(work, fp);
        } else {
                rsp->Flags = 0;
                rsp->AllocationSize = 0;
                rsp->EndOfFile = 0;
                rsp->Attributes = 0;
                rsp->CreationTime = 0;
                rsp->LastAccessTime = 0;
                rsp->LastWriteTime = 0;
                rsp->ChangeTime = 0;
        }

        err = ksmbd_close_fd(work, volatile_id);
out:
        if (err) {
                if (rsp->hdr.Status == 0)
                        rsp->hdr.Status = STATUS_FILE_CLOSED;
                smb2_set_err_rsp(work);
        } else {
                inc_rfc1001_len(rsp_org, 60);
        }

        return 0;
}

/**
 * smb2_echo() - handler for smb2 echo(ping) command
 * @work:       smb work containing echo request buffer
 *
 * Return:      0
 */
int smb2_echo(struct ksmbd_work *work)
{
        struct smb2_echo_rsp *rsp = work->response_buf;

        rsp->StructureSize = cpu_to_le16(4);
        rsp->Reserved = 0;
        inc_rfc1001_len(rsp, 4);
        return 0;
}

static int smb2_rename(struct ksmbd_work *work,
                       struct ksmbd_file *fp,
                       struct user_namespace *user_ns,
                       struct smb2_file_rename_info *file_info,
                       struct nls_table *local_nls)
{
        struct ksmbd_share_config *share = fp->tcon->share_conf;
        char *new_name = NULL, *abs_oldname = NULL, *old_name = NULL;
        char *pathname = NULL;
        struct path path;
        bool file_present = true;
        int rc;

        ksmbd_debug(SMB, "setting FILE_RENAME_INFO\n");
        pathname = kmalloc(PATH_MAX, GFP_KERNEL);
        if (!pathname)
                return -ENOMEM;

        abs_oldname = d_path(&fp->filp->f_path, pathname, PATH_MAX);
        if (IS_ERR(abs_oldname)) {
                rc = -EINVAL;
                goto out;
        }
        old_name = strrchr(abs_oldname, '/');
        if (old_name && old_name[1] != '\0') {
                old_name++;
        } else {
                ksmbd_debug(SMB, "can't get last component in path %s\n",
                            abs_oldname);
                rc = -ENOENT;
                goto out;
        }

        new_name = smb2_get_name(share,
                                 file_info->FileName,
                                 le32_to_cpu(file_info->FileNameLength),
                                 local_nls);
        if (IS_ERR(new_name)) {
                rc = PTR_ERR(new_name);
                goto out;
        }

        if (strchr(new_name, ':')) {
                int s_type;
                char *xattr_stream_name, *stream_name = NULL;
                size_t xattr_stream_size;
                int len;

                rc = parse_stream_name(new_name, &stream_name, &s_type);
                if (rc < 0)
                        goto out;

                len = strlen(new_name);
                if (len > 0 && new_name[len - 1] != '/') {
                        pr_err("not allow base filename in rename\n");
                        rc = -ESHARE;
                        goto out;
                }

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

                rc = ksmbd_vfs_setxattr(user_ns,
                                        fp->filp->f_path.dentry,
                                        xattr_stream_name,
                                        NULL, 0, 0);
                if (rc < 0) {
                        pr_err("failed to store stream name in xattr: %d\n",
                               rc);
                        rc = -EINVAL;
                        goto out;
                }

                goto out;
        }

        ksmbd_debug(SMB, "new name %s\n", new_name);
        rc = ksmbd_vfs_kern_path(work, new_name, LOOKUP_NO_SYMLINKS, &path, 1);
        if (rc) {
                if (rc != -ENOENT)
                        goto out;
                file_present = false;
        } else {
                path_put(&path);
        }

        if (ksmbd_share_veto_filename(share, new_name)) {
                rc = -ENOENT;
                ksmbd_debug(SMB, "Can't rename vetoed file: %s\n", new_name);
                goto out;
        }

        if (file_info->ReplaceIfExists) {
                if (file_present) {
                        rc = ksmbd_vfs_remove_file(work, new_name);
                        if (rc) {
                                if (rc != -ENOTEMPTY)
                                        rc = -EINVAL;
                                ksmbd_debug(SMB, "cannot delete %s, rc %d\n",
                                            new_name, rc);
                                goto out;
                        }
                }
        } else {
                if (file_present &&
                    strncmp(old_name, path.dentry->d_name.name, strlen(old_name))) {
                        rc = -EEXIST;
                        ksmbd_debug(SMB,
                                    "cannot rename already existing file\n");
                        goto out;
                }
        }

        rc = ksmbd_vfs_fp_rename(work, fp, new_name);
out:
        kfree(pathname);
        if (!IS_ERR(new_name))
                kfree(new_name);
        return rc;
}

static int smb2_create_link(struct ksmbd_work *work,
                            struct ksmbd_share_config *share,
                            struct smb2_file_link_info *file_info,
                            unsigned int buf_len, struct file *filp,
                            struct nls_table *local_nls)
{
        char *link_name = NULL, *target_name = NULL, *pathname = NULL;
        struct path path;
        bool file_present = true;
        int rc;

        if (buf_len < (u64)sizeof(struct smb2_file_link_info) +
                        le32_to_cpu(file_info->FileNameLength))
                return -EINVAL;

        ksmbd_debug(SMB, "setting FILE_LINK_INFORMATION\n");
        pathname = kmalloc(PATH_MAX, GFP_KERNEL);
        if (!pathname)
                return -ENOMEM;

        link_name = smb2_get_name(share,
                                  file_info->FileName,
                                  le32_to_cpu(file_info->FileNameLength),
                                  local_nls);
        if (IS_ERR(link_name) || S_ISDIR(file_inode(filp)->i_mode)) {
                rc = -EINVAL;
                goto out;
        }

        ksmbd_debug(SMB, "link name is %s\n", link_name);
        target_name = d_path(&filp->f_path, pathname, PATH_MAX);
        if (IS_ERR(target_name)) {
                rc = -EINVAL;
                goto out;
        }

        ksmbd_debug(SMB, "target name is %s\n", target_name);
        rc = ksmbd_vfs_kern_path(work, link_name, LOOKUP_NO_SYMLINKS, &path, 0);
        if (rc) {
                if (rc != -ENOENT)
                        goto out;
                file_present = false;
        } else {
                path_put(&path);
        }

        if (file_info->ReplaceIfExists) {
                if (file_present) {
                        rc = ksmbd_vfs_remove_file(work, link_name);
                        if (rc) {
                                rc = -EINVAL;
                                ksmbd_debug(SMB, "cannot delete %s\n",
                                            link_name);
                                goto out;
                        }
                }
        } else {
                if (file_present) {
                        rc = -EEXIST;
                        ksmbd_debug(SMB, "link already exists\n");
                        goto out;
                }
        }

        rc = ksmbd_vfs_link(work, target_name, link_name);
        if (rc)
                rc = -EINVAL;
out:
        if (!IS_ERR(link_name))
                kfree(link_name);
        kfree(pathname);
        return rc;
}

static int set_file_basic_info(struct ksmbd_file *fp,
                               struct smb2_file_basic_info *file_info,
                               struct ksmbd_share_config *share)
{
        struct iattr attrs;
        struct file *filp;
        struct inode *inode;
        struct user_namespace *user_ns;
        int rc = 0;

        if (!(fp->daccess & FILE_WRITE_ATTRIBUTES_LE))
                return -EACCES;

        attrs.ia_valid = 0;
        filp = fp->filp;
        inode = file_inode(filp);
        user_ns = file_mnt_user_ns(filp);

        if (file_info->CreationTime)
                fp->create_time = le64_to_cpu(file_info->CreationTime);

        if (file_info->LastAccessTime) {
                attrs.ia_atime = ksmbd_NTtimeToUnix(file_info->LastAccessTime);
                attrs.ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
        }

        attrs.ia_valid |= ATTR_CTIME;
        if (file_info->ChangeTime)
                attrs.ia_ctime = ksmbd_NTtimeToUnix(file_info->ChangeTime);
        else
                attrs.ia_ctime = inode->i_ctime;

        if (file_info->LastWriteTime) {
                attrs.ia_mtime = ksmbd_NTtimeToUnix(file_info->LastWriteTime);
                attrs.ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
        }

        if (file_info->Attributes) {
                if (!S_ISDIR(inode->i_mode) &&
                    file_info->Attributes & ATTR_DIRECTORY_LE) {
                        pr_err("can't change a file to a directory\n");
                        return -EINVAL;
                }

                if (!(S_ISDIR(inode->i_mode) && file_info->Attributes == ATTR_NORMAL_LE))
                        fp->f_ci->m_fattr = file_info->Attributes |
                                (fp->f_ci->m_fattr & ATTR_DIRECTORY_LE);
        }

        if (test_share_config_flag(share, KSMBD_SHARE_FLAG_STORE_DOS_ATTRS) &&
            (file_info->CreationTime || file_info->Attributes)) {
                struct xattr_dos_attrib da = {0};

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

                rc = ksmbd_vfs_set_dos_attrib_xattr(user_ns,
                                                    filp->f_path.dentry, &da);
                if (rc)
                        ksmbd_debug(SMB,
                                    "failed to restore file attribute in EA\n");
                rc = 0;
        }

        if (attrs.ia_valid) {
                struct dentry *dentry = filp->f_path.dentry;
                struct inode *inode = d_inode(dentry);

                if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                        return -EACCES;

                inode_lock(inode);
                inode->i_ctime = attrs.ia_ctime;
                attrs.ia_valid &= ~ATTR_CTIME;
                rc = notify_change(user_ns, dentry, &attrs, NULL);
                inode_unlock(inode);
        }
        return rc;
}

static int set_file_allocation_info(struct ksmbd_work *work,
                                    struct ksmbd_file *fp,
                                    struct smb2_file_alloc_info *file_alloc_info)
{
        /*
         * TODO : It's working fine only when store dos attributes
         * is not yes. need to implement a logic which works
         * properly with any smb.conf option
         */

        loff_t alloc_blks;
        struct inode *inode;
        int rc;

        if (!(fp->daccess & FILE_WRITE_DATA_LE))
                return -EACCES;

        alloc_blks = (le64_to_cpu(file_alloc_info->AllocationSize) + 511) >> 9;
        inode = file_inode(fp->filp);

        if (alloc_blks > inode->i_blocks) {
                smb_break_all_levII_oplock(work, fp, 1);
                rc = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0,
                                   alloc_blks * 512);
                if (rc && rc != -EOPNOTSUPP) {
                        pr_err("vfs_fallocate is failed : %d\n", rc);
                        return rc;
                }
        } else if (alloc_blks < inode->i_blocks) {
                loff_t size;

                /*
                 * Allocation size could be smaller than original one
                 * which means allocated blocks in file should be
                 * deallocated. use truncate to cut out it, but inode
                 * size is also updated with truncate offset.
                 * inode size is retained by backup inode size.
                 */
                size = i_size_read(inode);
                rc = ksmbd_vfs_truncate(work, fp, alloc_blks * 512);
                if (rc) {
                        pr_err("truncate failed! filename : %s, err %d\n",
                               fp->filename, rc);
                        return rc;
                }
                if (size < alloc_blks * 512)
                        i_size_write(inode, size);
        }
        return 0;
}

static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
                                struct smb2_file_eof_info *file_eof_info)
{
        loff_t newsize;
        struct inode *inode;
        int rc;

        if (!(fp->daccess & FILE_WRITE_DATA_LE))
                return -EACCES;

        newsize = le64_to_cpu(file_eof_info->EndOfFile);
        inode = file_inode(fp->filp);

        /*
         * If FILE_END_OF_FILE_INFORMATION of set_info_file is called
         * on FAT32 shared device, truncate execution time is too long
         * and network error could cause from windows client. because
         * truncate of some filesystem like FAT32 fill zero data in
         * truncated range.
         */
        if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC) {
                ksmbd_debug(SMB, "filename : %s truncated to newsize %lld\n",
                            fp->filename, newsize);
                rc = ksmbd_vfs_truncate(work, fp, newsize);
                if (rc) {
                        ksmbd_debug(SMB, "truncate failed! filename : %s err %d\n",
                                    fp->filename, rc);
                        if (rc != -EAGAIN)
                                rc = -EBADF;
                        return rc;
                }
        }
        return 0;
}

static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
                           struct smb2_file_rename_info *rename_info,
                           unsigned int buf_len)
{
        struct user_namespace *user_ns;
        struct ksmbd_file *parent_fp;
        struct dentry *parent;
        struct dentry *dentry = fp->filp->f_path.dentry;
        int ret;

        if (!(fp->daccess & FILE_DELETE_LE)) {
                pr_err("no right to delete : 0x%x\n", fp->daccess);
                return -EACCES;
        }

        if (buf_len < (u64)sizeof(struct smb2_file_rename_info) +
                        le32_to_cpu(rename_info->FileNameLength))
                return -EINVAL;

        user_ns = file_mnt_user_ns(fp->filp);
        if (ksmbd_stream_fd(fp))
                goto next;

        parent = dget_parent(dentry);
        ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
        if (ret) {
                dput(parent);
                return ret;
        }

        parent_fp = ksmbd_lookup_fd_inode(d_inode(parent));
        inode_unlock(d_inode(parent));
        dput(parent);

        if (parent_fp) {
                if (parent_fp->daccess & FILE_DELETE_LE) {
                        pr_err("parent dir is opened with delete access\n");
                        return -ESHARE;
                }
        }
next:
        return smb2_rename(work, fp, user_ns, rename_info,
                           work->sess->conn->local_nls);
}

static int set_file_disposition_info(struct ksmbd_file *fp,
                                     struct smb2_file_disposition_info *file_info)
{
        struct inode *inode;

        if (!(fp->daccess & FILE_DELETE_LE)) {
                pr_err("no right to delete : 0x%x\n", fp->daccess);
                return -EACCES;
        }

        inode = file_inode(fp->filp);
        if (file_info->DeletePending) {
                if (S_ISDIR(inode->i_mode) &&
                    ksmbd_vfs_empty_dir(fp) == -ENOTEMPTY)
                        return -EBUSY;
                ksmbd_set_inode_pending_delete(fp);
        } else {
                ksmbd_clear_inode_pending_delete(fp);
        }
        return 0;
}

static int set_file_position_info(struct ksmbd_file *fp,
                                  struct smb2_file_pos_info *file_info)
{
        loff_t current_byte_offset;
        unsigned long sector_size;
        struct inode *inode;

        inode = file_inode(fp->filp);
        current_byte_offset = le64_to_cpu(file_info->CurrentByteOffset);
        sector_size = inode->i_sb->s_blocksize;

        if (current_byte_offset < 0 ||
            (fp->coption == FILE_NO_INTERMEDIATE_BUFFERING_LE &&
             current_byte_offset & (sector_size - 1))) {
                pr_err("CurrentByteOffset is not valid : %llu\n",
                       current_byte_offset);
                return -EINVAL;
        }

        fp->filp->f_pos = current_byte_offset;
        return 0;
}

static int set_file_mode_info(struct ksmbd_file *fp,
                              struct smb2_file_mode_info *file_info)
{
        __le32 mode;

        mode = file_info->Mode;

        if ((mode & ~FILE_MODE_INFO_MASK) ||
            (mode & FILE_SYNCHRONOUS_IO_ALERT_LE &&
             mode & FILE_SYNCHRONOUS_IO_NONALERT_LE)) {
                pr_err("Mode is not valid : 0x%x\n", le32_to_cpu(mode));
                return -EINVAL;
        }

        /*
         * TODO : need to implement consideration for
         * FILE_SYNCHRONOUS_IO_ALERT and FILE_SYNCHRONOUS_IO_NONALERT
         */
        ksmbd_vfs_set_fadvise(fp->filp, mode);
        fp->coption = mode;
        return 0;
}

/**
 * smb2_set_info_file() - handler for smb2 set info command
 * @work:       smb work containing set info command buffer
 * @fp:         ksmbd_file pointer
 * @info_class: smb2 set info class
 * @share:      ksmbd_share_config pointer
 *
 * Return:      0 on success, otherwise error
 * TODO: need to implement an error handling for STATUS_INFO_LENGTH_MISMATCH
 */
static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
                              struct smb2_set_info_req *req,
                              struct ksmbd_share_config *share)
{
        unsigned int buf_len = le32_to_cpu(req->BufferLength);

        switch (req->FileInfoClass) {
        case FILE_BASIC_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_basic_info))
                        return -EINVAL;

                return set_file_basic_info(fp, (struct smb2_file_basic_info *)req->Buffer, share);
        }
        case FILE_ALLOCATION_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_alloc_info))
                        return -EINVAL;

                return set_file_allocation_info(work, fp,
                                                (struct smb2_file_alloc_info *)req->Buffer);
        }
        case FILE_END_OF_FILE_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_eof_info))
                        return -EINVAL;

                return set_end_of_file_info(work, fp,
                                            (struct smb2_file_eof_info *)req->Buffer);
        }
        case FILE_RENAME_INFORMATION:
        {
                if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
                        ksmbd_debug(SMB,
                                    "User does not have write permission\n");
                        return -EACCES;
                }

                if (buf_len < sizeof(struct smb2_file_rename_info))
                        return -EINVAL;

                return set_rename_info(work, fp,
                                       (struct smb2_file_rename_info *)req->Buffer,
                                       buf_len);
        }
        case FILE_LINK_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_link_info))
                        return -EINVAL;

                return smb2_create_link(work, work->tcon->share_conf,
                                        (struct smb2_file_link_info *)req->Buffer,
                                        buf_len, fp->filp,
                                        work->sess->conn->local_nls);
        }
        case FILE_DISPOSITION_INFORMATION:
        {
                if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
                        ksmbd_debug(SMB,
                                    "User does not have write permission\n");
                        return -EACCES;
                }

                if (buf_len < sizeof(struct smb2_file_disposition_info))
                        return -EINVAL;

                return set_file_disposition_info(fp,
                                                 (struct smb2_file_disposition_info *)req->Buffer);
        }
        case FILE_FULL_EA_INFORMATION:
        {
                if (!(fp->daccess & FILE_WRITE_EA_LE)) {
                        pr_err("Not permitted to write ext  attr: 0x%x\n",
                               fp->daccess);
                        return -EACCES;
                }

                if (buf_len < sizeof(struct smb2_ea_info))
                        return -EINVAL;

                return smb2_set_ea((struct smb2_ea_info *)req->Buffer,
                                   buf_len, &fp->filp->f_path);
        }
        case FILE_POSITION_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_pos_info))
                        return -EINVAL;

                return set_file_position_info(fp, (struct smb2_file_pos_info *)req->Buffer);
        }
        case FILE_MODE_INFORMATION:
        {
                if (buf_len < sizeof(struct smb2_file_mode_info))
                        return -EINVAL;

                return set_file_mode_info(fp, (struct smb2_file_mode_info *)req->Buffer);
        }
        }

        pr_err("Unimplemented Fileinfoclass :%d\n", req->FileInfoClass);
        return -EOPNOTSUPP;
}

static int smb2_set_info_sec(struct ksmbd_file *fp, int addition_info,
                             char *buffer, int buf_len)
{
        struct smb_ntsd *pntsd = (struct smb_ntsd *)buffer;

        fp->saccess |= FILE_SHARE_DELETE_LE;

        return set_info_sec(fp->conn, fp->tcon, &fp->filp->f_path, pntsd,
                        buf_len, false);
}

/**
 * smb2_set_info() - handler for smb2 set info command handler
 * @work:       smb work containing set info request buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_set_info(struct ksmbd_work *work)
{
        struct smb2_set_info_req *req;
        struct smb2_set_info_rsp *rsp, *rsp_org;
        struct ksmbd_file *fp;
        int rc = 0;
        unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;

        ksmbd_debug(SMB, "Received set info request\n");

        rsp_org = work->response_buf;
        if (work->next_smb2_rcv_hdr_off) {
                req = ksmbd_req_buf_next(work);
                rsp = ksmbd_resp_buf_next(work);
                if (!has_file_id(le64_to_cpu(req->VolatileFileId))) {
                        ksmbd_debug(SMB, "Compound request set FID = %llu\n",
                                    work->compound_fid);
                        id = work->compound_fid;
                        pid = work->compound_pfid;
                }
        } else {
                req = work->request_buf;
                rsp = work->response_buf;
        }

        if (!has_file_id(id)) {
                id = le64_to_cpu(req->VolatileFileId);
                pid = le64_to_cpu(req->PersistentFileId);
        }

        fp = ksmbd_lookup_fd_slow(work, id, pid);
        if (!fp) {
                ksmbd_debug(SMB, "Invalid id for close: %u\n", id);
                rc = -ENOENT;
                goto err_out;
        }

        switch (req->InfoType) {
        case SMB2_O_INFO_FILE:
                ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
                rc = smb2_set_info_file(work, fp, req, work->tcon->share_conf);
                break;
        case SMB2_O_INFO_SECURITY:
                ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
                if (ksmbd_override_fsids(work)) {
                        rc = -ENOMEM;
                        goto err_out;
                }
                rc = smb2_set_info_sec(fp,
                                       le32_to_cpu(req->AdditionalInformation),
                                       req->Buffer,
                                       le32_to_cpu(req->BufferLength));
                ksmbd_revert_fsids(work);
                break;
        default:
                rc = -EOPNOTSUPP;
        }

        if (rc < 0)
                goto err_out;

        rsp->StructureSize = cpu_to_le16(2);
        inc_rfc1001_len(rsp_org, 2);
        ksmbd_fd_put(work, fp);
        return 0;

err_out:
        if (rc == -EACCES || rc == -EPERM || rc == -EXDEV)
                rsp->hdr.Status = STATUS_ACCESS_DENIED;
        else if (rc == -EINVAL)
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
        else if (rc == -ESHARE)
                rsp->hdr.Status = STATUS_SHARING_VIOLATION;
        else if (rc == -ENOENT)
                rsp->hdr.Status = STATUS_OBJECT_NAME_INVALID;
        else if (rc == -EBUSY || rc == -ENOTEMPTY)
                rsp->hdr.Status = STATUS_DIRECTORY_NOT_EMPTY;
        else if (rc == -EAGAIN)
                rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
        else if (rc == -EBADF || rc == -ESTALE)
                rsp->hdr.Status = STATUS_INVALID_HANDLE;
        else if (rc == -EEXIST)
                rsp->hdr.Status = STATUS_OBJECT_NAME_COLLISION;
        else if (rsp->hdr.Status == 0 || rc == -EOPNOTSUPP)
                rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
        smb2_set_err_rsp(work);
        ksmbd_fd_put(work, fp);
        ksmbd_debug(SMB, "error while processing smb2 query rc = %d\n", rc);
        return rc;
}

/**
 * smb2_read_pipe() - handler for smb2 read from IPC pipe
 * @work:       smb work containing read IPC pipe command buffer
 *
 * Return:      0 on success, otherwise error
 */
static noinline int smb2_read_pipe(struct ksmbd_work *work)
{
        int nbytes = 0, err;
        u64 id;
        struct ksmbd_rpc_command *rpc_resp;
        struct smb2_read_req *req = work->request_buf;
        struct smb2_read_rsp *rsp = work->response_buf;

        id = le64_to_cpu(req->VolatileFileId);

        inc_rfc1001_len(rsp, 16);
        rpc_resp = ksmbd_rpc_read(work->sess, id);
        if (rpc_resp) {
                if (rpc_resp->flags != KSMBD_RPC_OK) {
                        err = -EINVAL;
                        goto out;
                }

                work->aux_payload_buf =
                        kvmalloc(rpc_resp->payload_sz, GFP_KERNEL | __GFP_ZERO);
                if (!work->aux_payload_buf) {
                        err = -ENOMEM;
                        goto out;
                }

                memcpy(work->aux_payload_buf, rpc_resp->payload,
                       rpc_resp->payload_sz);

                nbytes = rpc_resp->payload_sz;
                work->resp_hdr_sz = get_rfc1002_len(rsp) + 4;
                work->aux_payload_sz = nbytes;
                kvfree(rpc_resp);
        }

        rsp->StructureSize = cpu_to_le16(17);
        rsp->DataOffset = 80;
        rsp->Reserved = 0;
        rsp->DataLength = cpu_to_le32(nbytes);
        rsp->DataRemaining = 0;
        rsp->Reserved2 = 0;
        inc_rfc1001_len(rsp, nbytes);
        return 0;

out:
        rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
        smb2_set_err_rsp(work);
        kvfree(rpc_resp);
        return err;
}

static ssize_t smb2_read_rdma_channel(struct ksmbd_work *work,
                                      struct smb2_read_req *req, void *data_buf,
                                      size_t length)
{
        struct smb2_buffer_desc_v1 *desc =
                (struct smb2_buffer_desc_v1 *)&req->Buffer[0];
        int err;

        if (work->conn->dialect == SMB30_PROT_ID &&
            req->Channel != SMB2_CHANNEL_RDMA_V1)
                return -EINVAL;

        if (req->ReadChannelInfoOffset == 0 ||
            le16_to_cpu(req->ReadChannelInfoLength) < sizeof(*desc))
                return -EINVAL;

        work->need_invalidate_rkey =
                (req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE);
        work->remote_key = le32_to_cpu(desc->token);

        err = ksmbd_conn_rdma_write(work->conn, data_buf, length,
                                    le32_to_cpu(desc->token),
                                    le64_to_cpu(desc->offset),
                                    le32_to_cpu(desc->length));
        if (err)
                return err;

        return length;
}

/**
 * smb2_read() - handler for smb2 read from file
 * @work:       smb work containing read command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_read(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_read_req *req;
        struct smb2_read_rsp *rsp, *rsp_org;
        struct ksmbd_file *fp;
        loff_t offset;
        size_t length, mincount;
        ssize_t nbytes = 0, remain_bytes = 0;
        int err = 0;

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        if (test_share_config_flag(work->tcon->share_conf,
                                   KSMBD_SHARE_FLAG_PIPE)) {
                ksmbd_debug(SMB, "IPC pipe read request\n");
                return smb2_read_pipe(work);
        }

        fp = ksmbd_lookup_fd_slow(work, le64_to_cpu(req->VolatileFileId),
                                  le64_to_cpu(req->PersistentFileId));
        if (!fp) {
                err = -ENOENT;
                goto out;
        }

        if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_READ_ATTRIBUTES_LE))) {
                pr_err("Not permitted to read : 0x%x\n", fp->daccess);
                err = -EACCES;
                goto out;
        }

        offset = le64_to_cpu(req->Offset);
        length = le32_to_cpu(req->Length);
        mincount = le32_to_cpu(req->MinimumCount);

        if (length > conn->vals->max_read_size) {
                ksmbd_debug(SMB, "limiting read size to max size(%u)\n",
                            conn->vals->max_read_size);
                err = -EINVAL;
                goto out;
        }

        ksmbd_debug(SMB, "filename %pd, offset %lld, len %zu\n",
                    fp->filp->f_path.dentry, offset, length);

        work->aux_payload_buf = kvmalloc(length, GFP_KERNEL | __GFP_ZERO);
        if (!work->aux_payload_buf) {
                err = -ENOMEM;
                goto out;
        }

        nbytes = ksmbd_vfs_read(work, fp, length, &offset);
        if (nbytes < 0) {
                err = nbytes;
                goto out;
        }

        if ((nbytes == 0 && length != 0) || nbytes < mincount) {
                kvfree(work->aux_payload_buf);
                work->aux_payload_buf = NULL;
                rsp->hdr.Status = STATUS_END_OF_FILE;
                smb2_set_err_rsp(work);
                ksmbd_fd_put(work, fp);
                return 0;
        }

        ksmbd_debug(SMB, "nbytes %zu, offset %lld mincount %zu\n",
                    nbytes, offset, mincount);

        if (req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE ||
            req->Channel == SMB2_CHANNEL_RDMA_V1) {
                /* write data to the client using rdma channel */
                remain_bytes = smb2_read_rdma_channel(work, req,
                                                      work->aux_payload_buf,
                                                      nbytes);
                kvfree(work->aux_payload_buf);
                work->aux_payload_buf = NULL;

                nbytes = 0;
                if (remain_bytes < 0) {
                        err = (int)remain_bytes;
                        goto out;
                }
        }

        rsp->StructureSize = cpu_to_le16(17);
        rsp->DataOffset = 80;
        rsp->Reserved = 0;
        rsp->DataLength = cpu_to_le32(nbytes);
        rsp->DataRemaining = cpu_to_le32(remain_bytes);
        rsp->Reserved2 = 0;
        inc_rfc1001_len(rsp_org, 16);
        work->resp_hdr_sz = get_rfc1002_len(rsp_org) + 4;
        work->aux_payload_sz = nbytes;
        inc_rfc1001_len(rsp_org, nbytes);
        ksmbd_fd_put(work, fp);
        return 0;

out:
        if (err) {
                if (err == -EISDIR)
                        rsp->hdr.Status = STATUS_INVALID_DEVICE_REQUEST;
                else if (err == -EAGAIN)
                        rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
                else if (err == -ENOENT)
                        rsp->hdr.Status = STATUS_FILE_CLOSED;
                else if (err == -EACCES)
                        rsp->hdr.Status = STATUS_ACCESS_DENIED;
                else if (err == -ESHARE)
                        rsp->hdr.Status = STATUS_SHARING_VIOLATION;
                else if (err == -EINVAL)
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                else
                        rsp->hdr.Status = STATUS_INVALID_HANDLE;

                smb2_set_err_rsp(work);
        }
        ksmbd_fd_put(work, fp);
        return err;
}

/**
 * smb2_write_pipe() - handler for smb2 write on IPC pipe
 * @work:       smb work containing write IPC pipe command buffer
 *
 * Return:      0 on success, otherwise error
 */
static noinline int smb2_write_pipe(struct ksmbd_work *work)
{
        struct smb2_write_req *req = work->request_buf;
        struct smb2_write_rsp *rsp = work->response_buf;
        struct ksmbd_rpc_command *rpc_resp;
        u64 id = 0;
        int err = 0, ret = 0;
        char *data_buf;
        size_t length;

        length = le32_to_cpu(req->Length);
        id = le64_to_cpu(req->VolatileFileId);

        if (le16_to_cpu(req->DataOffset) ==
            (offsetof(struct smb2_write_req, Buffer) - 4)) {
                data_buf = (char *)&req->Buffer[0];
        } else {
                if ((u64)le16_to_cpu(req->DataOffset) + length > get_rfc1002_len(req)) {
                        pr_err("invalid write data offset %u, smb_len %u\n",
                               le16_to_cpu(req->DataOffset),
                               get_rfc1002_len(req));
                        err = -EINVAL;
                        goto out;
                }

                data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
                                le16_to_cpu(req->DataOffset));
        }

        rpc_resp = ksmbd_rpc_write(work->sess, id, data_buf, length);
        if (rpc_resp) {
                if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) {
                        rsp->hdr.Status = STATUS_NOT_SUPPORTED;
                        kvfree(rpc_resp);
                        smb2_set_err_rsp(work);
                        return -EOPNOTSUPP;
                }
                if (rpc_resp->flags != KSMBD_RPC_OK) {
                        rsp->hdr.Status = STATUS_INVALID_HANDLE;
                        smb2_set_err_rsp(work);
                        kvfree(rpc_resp);
                        return ret;
                }
                kvfree(rpc_resp);
        }

        rsp->StructureSize = cpu_to_le16(17);
        rsp->DataOffset = 0;
        rsp->Reserved = 0;
        rsp->DataLength = cpu_to_le32(length);
        rsp->DataRemaining = 0;
        rsp->Reserved2 = 0;
        inc_rfc1001_len(rsp, 16);
        return 0;
out:
        if (err) {
                rsp->hdr.Status = STATUS_INVALID_HANDLE;
                smb2_set_err_rsp(work);
        }

        return err;
}

static ssize_t smb2_write_rdma_channel(struct ksmbd_work *work,
                                       struct smb2_write_req *req,
                                       struct ksmbd_file *fp,
                                       loff_t offset, size_t length, bool sync)
{
        struct smb2_buffer_desc_v1 *desc;
        char *data_buf;
        int ret;
        ssize_t nbytes;

        desc = (struct smb2_buffer_desc_v1 *)&req->Buffer[0];

        if (work->conn->dialect == SMB30_PROT_ID &&
            req->Channel != SMB2_CHANNEL_RDMA_V1)
                return -EINVAL;

        if (req->Length != 0 || req->DataOffset != 0)
                return -EINVAL;

        if (req->WriteChannelInfoOffset == 0 ||
            le16_to_cpu(req->WriteChannelInfoLength) < sizeof(*desc))
                return -EINVAL;

        work->need_invalidate_rkey =
                (req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE);
        work->remote_key = le32_to_cpu(desc->token);

        data_buf = kvmalloc(length, GFP_KERNEL | __GFP_ZERO);
        if (!data_buf)
                return -ENOMEM;

        ret = ksmbd_conn_rdma_read(work->conn, data_buf, length,
                                   le32_to_cpu(desc->token),
                                   le64_to_cpu(desc->offset),
                                   le32_to_cpu(desc->length));
        if (ret < 0) {
                kvfree(data_buf);
                return ret;
        }

        ret = ksmbd_vfs_write(work, fp, data_buf, length, &offset, sync, &nbytes);
        kvfree(data_buf);
        if (ret < 0)
                return ret;

        return nbytes;
}

/**
 * smb2_write() - handler for smb2 write from file
 * @work:       smb work containing write command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_write(struct ksmbd_work *work)
{
        struct smb2_write_req *req;
        struct smb2_write_rsp *rsp, *rsp_org;
        struct ksmbd_file *fp = NULL;
        loff_t offset;
        size_t length;
        ssize_t nbytes;
        char *data_buf;
        bool writethrough = false;
        int err = 0;

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        if (test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_PIPE)) {
                ksmbd_debug(SMB, "IPC pipe write request\n");
                return smb2_write_pipe(work);
        }

        if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
                ksmbd_debug(SMB, "User does not have write permission\n");
                err = -EACCES;
                goto out;
        }

        fp = ksmbd_lookup_fd_slow(work, le64_to_cpu(req->VolatileFileId),
                                  le64_to_cpu(req->PersistentFileId));
        if (!fp) {
                err = -ENOENT;
                goto out;
        }

        if (!(fp->daccess & (FILE_WRITE_DATA_LE | FILE_READ_ATTRIBUTES_LE))) {
                pr_err("Not permitted to write : 0x%x\n", fp->daccess);
                err = -EACCES;
                goto out;
        }

        offset = le64_to_cpu(req->Offset);
        length = le32_to_cpu(req->Length);

        if (length > work->conn->vals->max_write_size) {
                ksmbd_debug(SMB, "limiting write size to max size(%u)\n",
                            work->conn->vals->max_write_size);
                err = -EINVAL;
                goto out;
        }

        if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)
                writethrough = true;

        if (req->Channel != SMB2_CHANNEL_RDMA_V1 &&
            req->Channel != SMB2_CHANNEL_RDMA_V1_INVALIDATE) {
                if (le16_to_cpu(req->DataOffset) ==
                    (offsetof(struct smb2_write_req, Buffer) - 4)) {
                        data_buf = (char *)&req->Buffer[0];
                } else {
                        if ((u64)le16_to_cpu(req->DataOffset) + length > get_rfc1002_len(req)) {
                                pr_err("invalid write data offset %u, smb_len %u\n",
                                       le16_to_cpu(req->DataOffset),
                                       get_rfc1002_len(req));
                                err = -EINVAL;
                                goto out;
                        }

                        data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
                                        le16_to_cpu(req->DataOffset));
                }

                ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags));
                if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)
                        writethrough = true;

                ksmbd_debug(SMB, "filename %pd, offset %lld, len %zu\n",
                            fp->filp->f_path.dentry, offset, length);
                err = ksmbd_vfs_write(work, fp, data_buf, length, &offset,
                                      writethrough, &nbytes);
                if (err < 0)
                        goto out;
        } else {
                /* read data from the client using rdma channel, and
                 * write the data.
                 */
                nbytes = smb2_write_rdma_channel(work, req, fp, offset,
                                                 le32_to_cpu(req->RemainingBytes),
                                                 writethrough);
                if (nbytes < 0) {
                        err = (int)nbytes;
                        goto out;
                }
        }

        rsp->StructureSize = cpu_to_le16(17);
        rsp->DataOffset = 0;
        rsp->Reserved = 0;
        rsp->DataLength = cpu_to_le32(nbytes);
        rsp->DataRemaining = 0;
        rsp->Reserved2 = 0;
        inc_rfc1001_len(rsp_org, 16);
        ksmbd_fd_put(work, fp);
        return 0;

out:
        if (err == -EAGAIN)
                rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
        else if (err == -ENOSPC || err == -EFBIG)
                rsp->hdr.Status = STATUS_DISK_FULL;
        else if (err == -ENOENT)
                rsp->hdr.Status = STATUS_FILE_CLOSED;
        else if (err == -EACCES)
                rsp->hdr.Status = STATUS_ACCESS_DENIED;
        else if (err == -ESHARE)
                rsp->hdr.Status = STATUS_SHARING_VIOLATION;
        else if (err == -EINVAL)
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
        else
                rsp->hdr.Status = STATUS_INVALID_HANDLE;

        smb2_set_err_rsp(work);
        ksmbd_fd_put(work, fp);
        return err;
}

/**
 * smb2_flush() - handler for smb2 flush file - fsync
 * @work:       smb work containing flush command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_flush(struct ksmbd_work *work)
{
        struct smb2_flush_req *req;
        struct smb2_flush_rsp *rsp, *rsp_org;
        int err;

        rsp_org = work->response_buf;
        WORK_BUFFERS(work, req, rsp);

        ksmbd_debug(SMB, "SMB2_FLUSH called for fid %llu\n",
                    le64_to_cpu(req->VolatileFileId));

        err = ksmbd_vfs_fsync(work,
                              le64_to_cpu(req->VolatileFileId),
                              le64_to_cpu(req->PersistentFileId));
        if (err)
                goto out;

        rsp->StructureSize = cpu_to_le16(4);
        rsp->Reserved = 0;
        inc_rfc1001_len(rsp_org, 4);
        return 0;

out:
        if (err) {
                rsp->hdr.Status = STATUS_INVALID_HANDLE;
                smb2_set_err_rsp(work);
        }

        return err;
}

/**
 * smb2_cancel() - handler for smb2 cancel command
 * @work:       smb work containing cancel command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_cancel(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_hdr *hdr = work->request_buf;
        struct smb2_hdr *chdr;
        struct ksmbd_work *cancel_work = NULL;
        int canceled = 0;
        struct list_head *command_list;

        ksmbd_debug(SMB, "smb2 cancel called on mid %llu, async flags 0x%x\n",
                    hdr->MessageId, hdr->Flags);

        if (hdr->Flags & SMB2_FLAGS_ASYNC_COMMAND) {
                command_list = &conn->async_requests;

                spin_lock(&conn->request_lock);
                list_for_each_entry(cancel_work, command_list,
                                    async_request_entry) {
                        chdr = cancel_work->request_buf;

                        if (cancel_work->async_id !=
                            le64_to_cpu(hdr->Id.AsyncId))
                                continue;

                        ksmbd_debug(SMB,
                                    "smb2 with AsyncId %llu cancelled command = 0x%x\n",
                                    le64_to_cpu(hdr->Id.AsyncId),
                                    le16_to_cpu(chdr->Command));
                        canceled = 1;
                        break;
                }
                spin_unlock(&conn->request_lock);
        } else {
                command_list = &conn->requests;

                spin_lock(&conn->request_lock);
                list_for_each_entry(cancel_work, command_list, request_entry) {
                        chdr = cancel_work->request_buf;

                        if (chdr->MessageId != hdr->MessageId ||
                            cancel_work == work)
                                continue;

                        ksmbd_debug(SMB,
                                    "smb2 with mid %llu cancelled command = 0x%x\n",
                                    le64_to_cpu(hdr->MessageId),
                                    le16_to_cpu(chdr->Command));
                        canceled = 1;
                        break;
                }
                spin_unlock(&conn->request_lock);
        }

        if (canceled) {
                cancel_work->state = KSMBD_WORK_CANCELLED;
                if (cancel_work->cancel_fn)
                        cancel_work->cancel_fn(cancel_work->cancel_argv);
        }

        /* For SMB2_CANCEL command itself send no response*/
        work->send_no_response = 1;
        return 0;
}

struct file_lock *smb_flock_init(struct file *f)
{
        struct file_lock *fl;

        fl = locks_alloc_lock();
        if (!fl)
                goto out;

        locks_init_lock(fl);

        fl->fl_owner = f;
        fl->fl_pid = current->tgid;
        fl->fl_file = f;
        fl->fl_flags = FL_POSIX;
        fl->fl_ops = NULL;
        fl->fl_lmops = NULL;

out:
        return fl;
}

static int smb2_set_flock_flags(struct file_lock *flock, int flags)
{
        int cmd = -EINVAL;

        /* Checking for wrong flag combination during lock request*/
        switch (flags) {
        case SMB2_LOCKFLAG_SHARED:
                ksmbd_debug(SMB, "received shared request\n");
                cmd = F_SETLKW;
                flock->fl_type = F_RDLCK;
                flock->fl_flags |= FL_SLEEP;
                break;
        case SMB2_LOCKFLAG_EXCLUSIVE:
                ksmbd_debug(SMB, "received exclusive request\n");
                cmd = F_SETLKW;
                flock->fl_type = F_WRLCK;
                flock->fl_flags |= FL_SLEEP;
                break;
        case SMB2_LOCKFLAG_SHARED | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
                ksmbd_debug(SMB,
                            "received shared & fail immediately request\n");
                cmd = F_SETLK;
                flock->fl_type = F_RDLCK;
                break;
        case SMB2_LOCKFLAG_EXCLUSIVE | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
                ksmbd_debug(SMB,
                            "received exclusive & fail immediately request\n");
                cmd = F_SETLK;
                flock->fl_type = F_WRLCK;
                break;
        case SMB2_LOCKFLAG_UNLOCK:
                ksmbd_debug(SMB, "received unlock request\n");
                flock->fl_type = F_UNLCK;
                cmd = 0;
                break;
        }

        return cmd;
}

static struct ksmbd_lock *smb2_lock_init(struct file_lock *flock,
                                         unsigned int cmd, int flags,
                                         struct list_head *lock_list)
{
        struct ksmbd_lock *lock;

        lock = kzalloc(sizeof(struct ksmbd_lock), GFP_KERNEL);
        if (!lock)
                return NULL;

        lock->cmd = cmd;
        lock->fl = flock;
        lock->start = flock->fl_start;
        lock->end = flock->fl_end;
        lock->flags = flags;
        if (lock->start == lock->end)
                lock->zero_len = 1;
        INIT_LIST_HEAD(&lock->clist);
        INIT_LIST_HEAD(&lock->flist);
        INIT_LIST_HEAD(&lock->llist);
        list_add_tail(&lock->llist, lock_list);

        return lock;
}

static void smb2_remove_blocked_lock(void **argv)
{
        struct file_lock *flock = (struct file_lock *)argv[0];

        ksmbd_vfs_posix_lock_unblock(flock);
        wake_up(&flock->fl_wait);
}

static inline bool lock_defer_pending(struct file_lock *fl)
{
        /* check pending lock waiters */
        return waitqueue_active(&fl->fl_wait);
}

/**
 * smb2_lock() - handler for smb2 file lock command
 * @work:       smb work containing lock command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_lock(struct ksmbd_work *work)
{
        struct smb2_lock_req *req = work->request_buf;
        struct smb2_lock_rsp *rsp = work->response_buf;
        struct smb2_lock_element *lock_ele;
        struct ksmbd_file *fp = NULL;
        struct file_lock *flock = NULL;
        struct file *filp = NULL;
        int lock_count;
        int flags = 0;
        int cmd = 0;
        int err = -EIO, i, rc = 0;
        u64 lock_start, lock_length;
        struct ksmbd_lock *smb_lock = NULL, *cmp_lock, *tmp, *tmp2;
        struct ksmbd_conn *conn;
        int nolock = 0;
        LIST_HEAD(lock_list);
        LIST_HEAD(rollback_list);
        int prior_lock = 0;

        ksmbd_debug(SMB, "Received lock request\n");
        fp = ksmbd_lookup_fd_slow(work,
                                  le64_to_cpu(req->VolatileFileId),
                                  le64_to_cpu(req->PersistentFileId));
        if (!fp) {
                ksmbd_debug(SMB, "Invalid file id for lock : %llu\n",
                            le64_to_cpu(req->VolatileFileId));
                err = -ENOENT;
                goto out2;
        }

        filp = fp->filp;
        lock_count = le16_to_cpu(req->LockCount);
        lock_ele = req->locks;

        ksmbd_debug(SMB, "lock count is %d\n", lock_count);
        if (!lock_count) {
                err = -EINVAL;
                goto out2;
        }

        for (i = 0; i < lock_count; i++) {
                flags = le32_to_cpu(lock_ele[i].Flags);

                flock = smb_flock_init(filp);
                if (!flock)
                        goto out;

                cmd = smb2_set_flock_flags(flock, flags);

                lock_start = le64_to_cpu(lock_ele[i].Offset);
                lock_length = le64_to_cpu(lock_ele[i].Length);
                if (lock_start > U64_MAX - lock_length) {
                        pr_err("Invalid lock range requested\n");
                        rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
                        goto out;
                }

                if (lock_start > OFFSET_MAX)
                        flock->fl_start = OFFSET_MAX;
                else
                        flock->fl_start = lock_start;

                lock_length = le64_to_cpu(lock_ele[i].Length);
                if (lock_length > OFFSET_MAX - flock->fl_start)
                        lock_length = OFFSET_MAX - flock->fl_start;

                flock->fl_end = flock->fl_start + lock_length;

                if (flock->fl_end < flock->fl_start) {
                        ksmbd_debug(SMB,
                                    "the end offset(%llx) is smaller than the start offset(%llx)\n",
                                    flock->fl_end, flock->fl_start);
                        rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
                        goto out;
                }

                /* Check conflict locks in one request */
                list_for_each_entry(cmp_lock, &lock_list, llist) {
                        if (cmp_lock->fl->fl_start <= flock->fl_start &&
                            cmp_lock->fl->fl_end >= flock->fl_end) {
                                if (cmp_lock->fl->fl_type != F_UNLCK &&
                                    flock->fl_type != F_UNLCK) {
                                        pr_err("conflict two locks in one request\n");
                                        err = -EINVAL;
                                        goto out;
                                }
                        }
                }

                smb_lock = smb2_lock_init(flock, cmd, flags, &lock_list);
                if (!smb_lock) {
                        err = -EINVAL;
                        goto out;
                }
        }

        list_for_each_entry_safe(smb_lock, tmp, &lock_list, llist) {
                if (smb_lock->cmd < 0) {
                        err = -EINVAL;
                        goto out;
                }

                if (!(smb_lock->flags & SMB2_LOCKFLAG_MASK)) {
                        err = -EINVAL;
                        goto out;
                }

                if ((prior_lock & (SMB2_LOCKFLAG_EXCLUSIVE | SMB2_LOCKFLAG_SHARED) &&
                     smb_lock->flags & SMB2_LOCKFLAG_UNLOCK) ||
                    (prior_lock == SMB2_LOCKFLAG_UNLOCK &&
                     !(smb_lock->flags & SMB2_LOCKFLAG_UNLOCK))) {
                        err = -EINVAL;
                        goto out;
                }

                prior_lock = smb_lock->flags;

                if (!(smb_lock->flags & SMB2_LOCKFLAG_UNLOCK) &&
                    !(smb_lock->flags & SMB2_LOCKFLAG_FAIL_IMMEDIATELY))
                        goto no_check_cl;

                nolock = 1;
                /* check locks in connection list */
                read_lock(&conn_list_lock);
                list_for_each_entry(conn, &conn_list, conns_list) {
                        spin_lock(&conn->llist_lock);
                        list_for_each_entry_safe(cmp_lock, tmp2, &conn->lock_list, clist) {
                                if (file_inode(cmp_lock->fl->fl_file) !=
                                    file_inode(smb_lock->fl->fl_file))
                                        continue;

                                if (smb_lock->fl->fl_type == F_UNLCK) {
                                        if (cmp_lock->fl->fl_file == smb_lock->fl->fl_file &&
                                            cmp_lock->start == smb_lock->start &&
                                            cmp_lock->end == smb_lock->end &&
                                            !lock_defer_pending(cmp_lock->fl)) {
                                                nolock = 0;
                                                list_del(&cmp_lock->flist);
                                                list_del(&cmp_lock->clist);
                                                spin_unlock(&conn->llist_lock);
                                                read_unlock(&conn_list_lock);

                                                locks_free_lock(cmp_lock->fl);
                                                kfree(cmp_lock);
                                                goto out_check_cl;
                                        }
                                        continue;
                                }

                                if (cmp_lock->fl->fl_file == smb_lock->fl->fl_file) {
                                        if (smb_lock->flags & SMB2_LOCKFLAG_SHARED)
                                                continue;
                                } else {
                                        if (cmp_lock->flags & SMB2_LOCKFLAG_SHARED)
                                                continue;
                                }

                                /* check zero byte lock range */
                                if (cmp_lock->zero_len && !smb_lock->zero_len &&
                                    cmp_lock->start > smb_lock->start &&
                                    cmp_lock->start < smb_lock->end) {
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("previous lock conflict with zero byte lock range\n");
                                        goto out;
                                }

                                if (smb_lock->zero_len && !cmp_lock->zero_len &&
                                    smb_lock->start > cmp_lock->start &&
                                    smb_lock->start < cmp_lock->end) {
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("current lock conflict with zero byte lock range\n");
                                        goto out;
                                }

                                if (((cmp_lock->start <= smb_lock->start &&
                                      cmp_lock->end > smb_lock->start) ||
                                     (cmp_lock->start < smb_lock->end &&
                                      cmp_lock->end >= smb_lock->end)) &&
                                    !cmp_lock->zero_len && !smb_lock->zero_len) {
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("Not allow lock operation on exclusive lock range\n");
                                        goto out;
                                }
                        }
                        spin_unlock(&conn->llist_lock);
                }
                read_unlock(&conn_list_lock);
out_check_cl:
                if (smb_lock->fl->fl_type == F_UNLCK && nolock) {
                        pr_err("Try to unlock nolocked range\n");
                        rsp->hdr.Status = STATUS_RANGE_NOT_LOCKED;
                        goto out;
                }

no_check_cl:
                if (smb_lock->zero_len) {
                        err = 0;
                        goto skip;
                }

                flock = smb_lock->fl;
                list_del(&smb_lock->llist);
retry:
                rc = vfs_lock_file(filp, smb_lock->cmd, flock, NULL);
skip:
                if (flags & SMB2_LOCKFLAG_UNLOCK) {
                        if (!rc) {
                                ksmbd_debug(SMB, "File unlocked\n");
                        } else if (rc == -ENOENT) {
                                rsp->hdr.Status = STATUS_NOT_LOCKED;
                                goto out;
                        }
                        locks_free_lock(flock);
                        kfree(smb_lock);
                } else {
                        if (rc == FILE_LOCK_DEFERRED) {
                                void **argv;

                                ksmbd_debug(SMB,
                                            "would have to wait for getting lock\n");
                                spin_lock(&work->conn->llist_lock);
                                list_add_tail(&smb_lock->clist,
                                              &work->conn->lock_list);
                                spin_unlock(&work->conn->llist_lock);
                                list_add(&smb_lock->llist, &rollback_list);

                                argv = kmalloc(sizeof(void *), GFP_KERNEL);
                                if (!argv) {
                                        err = -ENOMEM;
                                        goto out;
                                }
                                argv[0] = flock;

                                rc = setup_async_work(work,
                                                      smb2_remove_blocked_lock,
                                                      argv);
                                if (rc) {
                                        err = -ENOMEM;
                                        goto out;
                                }
                                spin_lock(&fp->f_lock);
                                list_add(&work->fp_entry, &fp->blocked_works);
                                spin_unlock(&fp->f_lock);

                                smb2_send_interim_resp(work, STATUS_PENDING);

                                ksmbd_vfs_posix_lock_wait(flock);

                                if (work->state != KSMBD_WORK_ACTIVE) {
                                        list_del(&smb_lock->llist);
                                        spin_lock(&work->conn->llist_lock);
                                        list_del(&smb_lock->clist);
                                        spin_unlock(&work->conn->llist_lock);
                                        locks_free_lock(flock);

                                        if (work->state == KSMBD_WORK_CANCELLED) {
                                                spin_lock(&fp->f_lock);
                                                list_del(&work->fp_entry);
                                                spin_unlock(&fp->f_lock);
                                                rsp->hdr.Status =
                                                        STATUS_CANCELLED;
                                                kfree(smb_lock);
                                                smb2_send_interim_resp(work,
                                                                       STATUS_CANCELLED);
                                                work->send_no_response = 1;
                                                goto out;
                                        }
                                        init_smb2_rsp_hdr(work);
                                        smb2_set_err_rsp(work);
                                        rsp->hdr.Status =
                                                STATUS_RANGE_NOT_LOCKED;
                                        kfree(smb_lock);
                                        goto out2;
                                }

                                list_del(&smb_lock->llist);
                                spin_lock(&work->conn->llist_lock);
                                list_del(&smb_lock->clist);
                                spin_unlock(&work->conn->llist_lock);

                                spin_lock(&fp->f_lock);
                                list_del(&work->fp_entry);
                                spin_unlock(&fp->f_lock);
                                goto retry;
                        } else if (!rc) {
                                spin_lock(&work->conn->llist_lock);
                                list_add_tail(&smb_lock->clist,
                                              &work->conn->lock_list);
                                list_add_tail(&smb_lock->flist,
                                              &fp->lock_list);
                                spin_unlock(&work->conn->llist_lock);
                                list_add(&smb_lock->llist, &rollback_list);
                                ksmbd_debug(SMB, "successful in taking lock\n");
                        } else {
                                goto out;
                        }
                }
        }

        if (atomic_read(&fp->f_ci->op_count) > 1)
                smb_break_all_oplock(work, fp);

        rsp->StructureSize = cpu_to_le16(4);
        ksmbd_debug(SMB, "successful in taking lock\n");
        rsp->hdr.Status = STATUS_SUCCESS;
        rsp->Reserved = 0;
        inc_rfc1001_len(rsp, 4);
        ksmbd_fd_put(work, fp);
        return 0;

out:
        list_for_each_entry_safe(smb_lock, tmp, &lock_list, llist) {
                locks_free_lock(smb_lock->fl);
                list_del(&smb_lock->llist);
                kfree(smb_lock);
        }

        list_for_each_entry_safe(smb_lock, tmp, &rollback_list, llist) {
                struct file_lock *rlock = NULL;

                rlock = smb_flock_init(filp);
                rlock->fl_type = F_UNLCK;
                rlock->fl_start = smb_lock->start;
                rlock->fl_end = smb_lock->end;

                rc = vfs_lock_file(filp, 0, rlock, NULL);
                if (rc)
                        pr_err("rollback unlock fail : %d\n", rc);

                list_del(&smb_lock->llist);
                spin_lock(&work->conn->llist_lock);
                if (!list_empty(&smb_lock->flist))
                        list_del(&smb_lock->flist);
                list_del(&smb_lock->clist);
                spin_unlock(&work->conn->llist_lock);

                locks_free_lock(smb_lock->fl);
                locks_free_lock(rlock);
                kfree(smb_lock);
        }
out2:
        ksmbd_debug(SMB, "failed in taking lock(flags : %x), err : %d\n", flags, err);

        if (!rsp->hdr.Status) {
                if (err == -EINVAL)
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                else if (err == -ENOMEM)
                        rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
                else if (err == -ENOENT)
                        rsp->hdr.Status = STATUS_FILE_CLOSED;
                else
                        rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
        }

        smb2_set_err_rsp(work);
        ksmbd_fd_put(work, fp);
        return err;
}

static int fsctl_copychunk(struct ksmbd_work *work,
                           struct copychunk_ioctl_req *ci_req,
                           unsigned int cnt_code,
                           unsigned int input_count,
                           unsigned long long volatile_id,
                           unsigned long long persistent_id,
                           struct smb2_ioctl_rsp *rsp)
{
        struct copychunk_ioctl_rsp *ci_rsp;
        struct ksmbd_file *src_fp = NULL, *dst_fp = NULL;
        struct srv_copychunk *chunks;
        unsigned int i, chunk_count, chunk_count_written = 0;
        unsigned int chunk_size_written = 0;
        loff_t total_size_written = 0;
        int ret = 0;

        ci_rsp = (struct copychunk_ioctl_rsp *)&rsp->Buffer[0];

        rsp->VolatileFileId = cpu_to_le64(volatile_id);
        rsp->PersistentFileId = cpu_to_le64(persistent_id);
        ci_rsp->ChunksWritten =
                cpu_to_le32(ksmbd_server_side_copy_max_chunk_count());
        ci_rsp->ChunkBytesWritten =
                cpu_to_le32(ksmbd_server_side_copy_max_chunk_size());
        ci_rsp->TotalBytesWritten =
                cpu_to_le32(ksmbd_server_side_copy_max_total_size());

        chunks = (struct srv_copychunk *)&ci_req->Chunks[0];
        chunk_count = le32_to_cpu(ci_req->ChunkCount);
        if (chunk_count == 0)
                goto out;
        total_size_written = 0;

        /* verify the SRV_COPYCHUNK_COPY packet */
        if (chunk_count > ksmbd_server_side_copy_max_chunk_count() ||
            input_count < offsetof(struct copychunk_ioctl_req, Chunks) +
             chunk_count * sizeof(struct srv_copychunk)) {
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                return -EINVAL;
        }

        for (i = 0; i < chunk_count; i++) {
                if (le32_to_cpu(chunks[i].Length) == 0 ||
                    le32_to_cpu(chunks[i].Length) > ksmbd_server_side_copy_max_chunk_size())
                        break;
                total_size_written += le32_to_cpu(chunks[i].Length);
        }

        if (i < chunk_count ||
            total_size_written > ksmbd_server_side_copy_max_total_size()) {
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                return -EINVAL;
        }

        src_fp = ksmbd_lookup_foreign_fd(work,
                                         le64_to_cpu(ci_req->ResumeKey[0]));
        dst_fp = ksmbd_lookup_fd_slow(work, volatile_id, persistent_id);
        ret = -EINVAL;
        if (!src_fp ||
            src_fp->persistent_id != le64_to_cpu(ci_req->ResumeKey[1])) {
                rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
                goto out;
        }

        if (!dst_fp) {
                rsp->hdr.Status = STATUS_FILE_CLOSED;
                goto out;
        }

        /*
         * FILE_READ_DATA should only be included in
         * the FSCTL_COPYCHUNK case
         */
        if (cnt_code == FSCTL_COPYCHUNK &&
            !(dst_fp->daccess & (FILE_READ_DATA_LE | FILE_GENERIC_READ_LE))) {
                rsp->hdr.Status = STATUS_ACCESS_DENIED;
                goto out;
        }

        ret = ksmbd_vfs_copy_file_ranges(work, src_fp, dst_fp,
                                         chunks, chunk_count,
                                         &chunk_count_written,
                                         &chunk_size_written,
                                         &total_size_written);
        if (ret < 0) {
                if (ret == -EACCES)
                        rsp->hdr.Status = STATUS_ACCESS_DENIED;
                if (ret == -EAGAIN)
                        rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
                else if (ret == -EBADF)
                        rsp->hdr.Status = STATUS_INVALID_HANDLE;
                else if (ret == -EFBIG || ret == -ENOSPC)
                        rsp->hdr.Status = STATUS_DISK_FULL;
                else if (ret == -EINVAL)
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                else if (ret == -EISDIR)
                        rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
                else if (ret == -E2BIG)
                        rsp->hdr.Status = STATUS_INVALID_VIEW_SIZE;
                else
                        rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
        }

        ci_rsp->ChunksWritten = cpu_to_le32(chunk_count_written);
        ci_rsp->ChunkBytesWritten = cpu_to_le32(chunk_size_written);
        ci_rsp->TotalBytesWritten = cpu_to_le32(total_size_written);
out:
        ksmbd_fd_put(work, src_fp);
        ksmbd_fd_put(work, dst_fp);
        return ret;
}

static __be32 idev_ipv4_address(struct in_device *idev)
{
        __be32 addr = 0;

        struct in_ifaddr *ifa;

        rcu_read_lock();
        in_dev_for_each_ifa_rcu(ifa, idev) {
                if (ifa->ifa_flags & IFA_F_SECONDARY)
                        continue;

                addr = ifa->ifa_address;
                break;
        }
        rcu_read_unlock();
        return addr;
}

static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
                                        struct smb2_ioctl_rsp *rsp,
                                        unsigned int out_buf_len)
{
        struct network_interface_info_ioctl_rsp *nii_rsp = NULL;
        int nbytes = 0;
        struct net_device *netdev;
        struct sockaddr_storage_rsp *sockaddr_storage;
        unsigned int flags;
        unsigned long long speed;
        struct sockaddr_in6 *csin6 = (struct sockaddr_in6 *)&conn->peer_addr;

        rtnl_lock();
        for_each_netdev(&init_net, netdev) {
                if (out_buf_len <
                    nbytes + sizeof(struct network_interface_info_ioctl_rsp)) {
                        rtnl_unlock();
                        return -ENOSPC;
                }

                if (netdev->type == ARPHRD_LOOPBACK)
                        continue;

                flags = dev_get_flags(netdev);
                if (!(flags & IFF_RUNNING))
                        continue;

                nii_rsp = (struct network_interface_info_ioctl_rsp *)
                                &rsp->Buffer[nbytes];
                nii_rsp->IfIndex = cpu_to_le32(netdev->ifindex);

                nii_rsp->Capability = 0;
                if (ksmbd_rdma_capable_netdev(netdev))
                        nii_rsp->Capability |= cpu_to_le32(RDMA_CAPABLE);

                nii_rsp->Next = cpu_to_le32(152);
                nii_rsp->Reserved = 0;

                if (netdev->ethtool_ops->get_link_ksettings) {
                        struct ethtool_link_ksettings cmd;

                        netdev->ethtool_ops->get_link_ksettings(netdev, &cmd);
                        speed = cmd.base.speed;
                } else {
                        ksmbd_debug(SMB, "%s %s\n", netdev->name,
                                    "speed is unknown, defaulting to 1Gb/sec");
                        speed = SPEED_1000;
                }

                speed *= 1000000;
                nii_rsp->LinkSpeed = cpu_to_le64(speed);

                sockaddr_storage = (struct sockaddr_storage_rsp *)
                                        nii_rsp->SockAddr_Storage;
                memset(sockaddr_storage, 0, 128);

                if (conn->peer_addr.ss_family == PF_INET ||
                    ipv6_addr_v4mapped(&csin6->sin6_addr)) {
                        struct in_device *idev;

                        sockaddr_storage->Family = cpu_to_le16(INTERNETWORK);
                        sockaddr_storage->addr4.Port = 0;

                        idev = __in_dev_get_rtnl(netdev);
                        if (!idev)
                                continue;
                        sockaddr_storage->addr4.IPv4address =
                                                idev_ipv4_address(idev);
                } else {
                        struct inet6_dev *idev6;
                        struct inet6_ifaddr *ifa;
                        __u8 *ipv6_addr = sockaddr_storage->addr6.IPv6address;

                        sockaddr_storage->Family = cpu_to_le16(INTERNETWORKV6);
                        sockaddr_storage->addr6.Port = 0;
                        sockaddr_storage->addr6.FlowInfo = 0;

                        idev6 = __in6_dev_get(netdev);
                        if (!idev6)
                                continue;

                        list_for_each_entry(ifa, &idev6->addr_list, if_list) {
                                if (ifa->flags & (IFA_F_TENTATIVE |
                                                        IFA_F_DEPRECATED))
                                        continue;
                                memcpy(ipv6_addr, ifa->addr.s6_addr, 16);
                                break;
                        }
                        sockaddr_storage->addr6.ScopeId = 0;
                }

                nbytes += sizeof(struct network_interface_info_ioctl_rsp);
        }
        rtnl_unlock();

        /* zero if this is last one */
        if (nii_rsp)
                nii_rsp->Next = 0;

        rsp->PersistentFileId = cpu_to_le64(SMB2_NO_FID);
        rsp->VolatileFileId = cpu_to_le64(SMB2_NO_FID);
        return nbytes;
}

static int fsctl_validate_negotiate_info(struct ksmbd_conn *conn,
                                         struct validate_negotiate_info_req *neg_req,
                                         struct validate_negotiate_info_rsp *neg_rsp,
                                         unsigned int in_buf_len)
{
        int ret = 0;
        int dialect;

        if (in_buf_len < offsetof(struct validate_negotiate_info_req, Dialects) +
                        le16_to_cpu(neg_req->DialectCount) * sizeof(__le16))
                return -EINVAL;

        dialect = ksmbd_lookup_dialect_by_id(neg_req->Dialects,
                                             neg_req->DialectCount);
        if (dialect == BAD_PROT_ID || dialect != conn->dialect) {
                ret = -EINVAL;
                goto err_out;
        }

        if (strncmp(neg_req->Guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE)) {
                ret = -EINVAL;
                goto err_out;
        }

        if (le16_to_cpu(neg_req->SecurityMode) != conn->cli_sec_mode) {
                ret = -EINVAL;
                goto err_out;
        }

        if (le32_to_cpu(neg_req->Capabilities) != conn->cli_cap) {
                ret = -EINVAL;
                goto err_out;
        }

        neg_rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
        memset(neg_rsp->Guid, 0, SMB2_CLIENT_GUID_SIZE);
        neg_rsp->SecurityMode = cpu_to_le16(conn->srv_sec_mode);
        neg_rsp->Dialect = cpu_to_le16(conn->dialect);
err_out:
        return ret;
}

static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
                                        struct file_allocated_range_buffer *qar_req,
                                        struct file_allocated_range_buffer *qar_rsp,
                                        unsigned int in_count, unsigned int *out_count)
{
        struct ksmbd_file *fp;
        loff_t start, length;
        int ret = 0;

        *out_count = 0;
        if (in_count == 0)
                return -EINVAL;

        fp = ksmbd_lookup_fd_fast(work, id);
        if (!fp)
                return -ENOENT;

        start = le64_to_cpu(qar_req->file_offset);
        length = le64_to_cpu(qar_req->length);

        ret = ksmbd_vfs_fqar_lseek(fp, start, length,
                                   qar_rsp, in_count, out_count);
        if (ret && ret != -E2BIG)
                *out_count = 0;

        ksmbd_fd_put(work, fp);
        return ret;
}

static int fsctl_pipe_transceive(struct ksmbd_work *work, u64 id,
                                 unsigned int out_buf_len,
                                 struct smb2_ioctl_req *req,
                                 struct smb2_ioctl_rsp *rsp)
{
        struct ksmbd_rpc_command *rpc_resp;
        char *data_buf = (char *)&req->Buffer[0];
        int nbytes = 0;

        rpc_resp = ksmbd_rpc_ioctl(work->sess, id, data_buf,
                                   le32_to_cpu(req->InputCount));
        if (rpc_resp) {
                if (rpc_resp->flags == KSMBD_RPC_SOME_NOT_MAPPED) {
                        /*
                         * set STATUS_SOME_NOT_MAPPED response
                         * for unknown domain sid.
                         */
                        rsp->hdr.Status = STATUS_SOME_NOT_MAPPED;
                } else if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) {
                        rsp->hdr.Status = STATUS_NOT_SUPPORTED;
                        goto out;
                } else if (rpc_resp->flags != KSMBD_RPC_OK) {
                        rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                        goto out;
                }

                nbytes = rpc_resp->payload_sz;
                if (rpc_resp->payload_sz > out_buf_len) {
                        rsp->hdr.Status = STATUS_BUFFER_OVERFLOW;
                        nbytes = out_buf_len;
                }

                if (!rpc_resp->payload_sz) {
                        rsp->hdr.Status =
                                STATUS_UNEXPECTED_IO_ERROR;
                        goto out;
                }

                memcpy((char *)rsp->Buffer, rpc_resp->payload, nbytes);
        }
out:
        kvfree(rpc_resp);
        return nbytes;
}

static inline int fsctl_set_sparse(struct ksmbd_work *work, u64 id,
                                   struct file_sparse *sparse)
{
        struct ksmbd_file *fp;
        struct user_namespace *user_ns;
        int ret = 0;
        __le32 old_fattr;

        fp = ksmbd_lookup_fd_fast(work, id);
        if (!fp)
                return -ENOENT;
        user_ns = file_mnt_user_ns(fp->filp);

        old_fattr = fp->f_ci->m_fattr;
        if (sparse->SetSparse)
                fp->f_ci->m_fattr |= ATTR_SPARSE_FILE_LE;
        else
                fp->f_ci->m_fattr &= ~ATTR_SPARSE_FILE_LE;

        if (fp->f_ci->m_fattr != old_fattr &&
            test_share_config_flag(work->tcon->share_conf,
                                   KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
                struct xattr_dos_attrib da;

                ret = ksmbd_vfs_get_dos_attrib_xattr(user_ns,
                                                     fp->filp->f_path.dentry, &da);
                if (ret <= 0)
                        goto out;

                da.attr = le32_to_cpu(fp->f_ci->m_fattr);
                ret = ksmbd_vfs_set_dos_attrib_xattr(user_ns,
                                                     fp->filp->f_path.dentry, &da);
                if (ret)
                        fp->f_ci->m_fattr = old_fattr;
        }

out:
        ksmbd_fd_put(work, fp);
        return ret;
}

static int fsctl_request_resume_key(struct ksmbd_work *work,
                                    struct smb2_ioctl_req *req,
                                    struct resume_key_ioctl_rsp *key_rsp)
{
        struct ksmbd_file *fp;

        fp = ksmbd_lookup_fd_slow(work,
                                  le64_to_cpu(req->VolatileFileId),
                                  le64_to_cpu(req->PersistentFileId));
        if (!fp)
                return -ENOENT;

        memset(key_rsp, 0, sizeof(*key_rsp));
        key_rsp->ResumeKey[0] = req->VolatileFileId;
        key_rsp->ResumeKey[1] = req->PersistentFileId;
        ksmbd_fd_put(work, fp);

        return 0;
}

/**
 * smb2_ioctl() - handler for smb2 ioctl command
 * @work:       smb work containing ioctl command buffer
 *
 * Return:      0 on success, otherwise error
 */
int smb2_ioctl(struct ksmbd_work *work)
{
        struct smb2_ioctl_req *req;
        struct smb2_ioctl_rsp *rsp, *rsp_org;
        unsigned int cnt_code, nbytes = 0, out_buf_len, in_buf_len;
        u64 id = KSMBD_NO_FID;
        struct ksmbd_conn *conn = work->conn;
        int ret = 0;

        rsp_org = work->response_buf;
        if (work->next_smb2_rcv_hdr_off) {
                req = ksmbd_req_buf_next(work);
                rsp = ksmbd_resp_buf_next(work);
                if (!has_file_id(le64_to_cpu(req->VolatileFileId))) {
                        ksmbd_debug(SMB, "Compound request set FID = %llu\n",
                                    work->compound_fid);
                        id = work->compound_fid;
                }
        } else {
                req = work->request_buf;
                rsp = work->response_buf;
        }

        if (!has_file_id(id))
                id = le64_to_cpu(req->VolatileFileId);

        if (req->Flags != cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL)) {
                rsp->hdr.Status = STATUS_NOT_SUPPORTED;
                goto out;
        }

        cnt_code = le32_to_cpu(req->CntCode);
        ret = smb2_calc_max_out_buf_len(work, 48,
                                        le32_to_cpu(req->MaxOutputResponse));
        if (ret < 0) {
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                goto out;
        }
        out_buf_len = (unsigned int)ret;
        in_buf_len = le32_to_cpu(req->InputCount);

        switch (cnt_code) {
        case FSCTL_DFS_GET_REFERRALS:
        case FSCTL_DFS_GET_REFERRALS_EX:
                /* Not support DFS yet */
                rsp->hdr.Status = STATUS_FS_DRIVER_REQUIRED;
                goto out;
        case FSCTL_CREATE_OR_GET_OBJECT_ID:
        {
                struct file_object_buf_type1_ioctl_rsp *obj_buf;

                nbytes = sizeof(struct file_object_buf_type1_ioctl_rsp);
                obj_buf = (struct file_object_buf_type1_ioctl_rsp *)
                        &rsp->Buffer[0];

                /*
                 * TODO: This is dummy implementation to pass smbtorture
                 * Need to check correct response later
                 */
                memset(obj_buf->ObjectId, 0x0, 16);
                memset(obj_buf->BirthVolumeId, 0x0, 16);
                memset(obj_buf->BirthObjectId, 0x0, 16);
                memset(obj_buf->DomainId, 0x0, 16);

                break;
        }
        case FSCTL_PIPE_TRANSCEIVE:
                out_buf_len = min_t(u32, KSMBD_IPC_MAX_PAYLOAD, out_buf_len);
                nbytes = fsctl_pipe_transceive(work, id, out_buf_len, req, rsp);
                break;
        case FSCTL_VALIDATE_NEGOTIATE_INFO:
                if (conn->dialect < SMB30_PROT_ID) {
                        ret = -EOPNOTSUPP;
                        goto out;
                }

                if (in_buf_len < sizeof(struct validate_negotiate_info_req))
                        return -EINVAL;

                if (out_buf_len < sizeof(struct validate_negotiate_info_rsp))
                        return -EINVAL;

                ret = fsctl_validate_negotiate_info(conn,
                        (struct validate_negotiate_info_req *)&req->Buffer[0],
                        (struct validate_negotiate_info_rsp *)&rsp->Buffer[0],
                        in_buf_len);
                if (ret < 0)
                        goto out;

                nbytes = sizeof(struct validate_negotiate_info_rsp);
                rsp->PersistentFileId = cpu_to_le64(SMB2_NO_FID);
                rsp->VolatileFileId = cpu_to_le64(SMB2_NO_FID);
                break;
        case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
                ret = fsctl_query_iface_info_ioctl(conn, rsp, out_buf_len);
                if (ret < 0)
                        goto out;
                nbytes = ret;
                break;
        case FSCTL_REQUEST_RESUME_KEY:
                if (out_buf_len < sizeof(struct resume_key_ioctl_rsp)) {
                        ret = -EINVAL;
                        goto out;
                }

                ret = fsctl_request_resume_key(work, req,
                                               (struct resume_key_ioctl_rsp *)&rsp->Buffer[0]);
                if (ret < 0)
                        goto out;
                rsp->PersistentFileId = req->PersistentFileId;
                rsp->VolatileFileId = req->VolatileFileId;
                nbytes = sizeof(struct resume_key_ioctl_rsp);
                break;
        case FSCTL_COPYCHUNK:
        case FSCTL_COPYCHUNK_WRITE:
                if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
                        ksmbd_debug(SMB,
                                    "User does not have write permission\n");
                        ret = -EACCES;
                        goto out;
                }

                if (in_buf_len < sizeof(struct copychunk_ioctl_req)) {
                        ret = -EINVAL;
                        goto out;
                }

                if (out_buf_len < sizeof(struct copychunk_ioctl_rsp)) {
                        ret = -EINVAL;
                        goto out;
                }

                nbytes = sizeof(struct copychunk_ioctl_rsp);
                rsp->VolatileFileId = req->VolatileFileId;
                rsp->PersistentFileId = req->PersistentFileId;
                fsctl_copychunk(work,
                                (struct copychunk_ioctl_req *)&req->Buffer[0],
                                le32_to_cpu(req->CntCode),
                                le32_to_cpu(req->InputCount),
                                le64_to_cpu(req->VolatileFileId),
                                le64_to_cpu(req->PersistentFileId),
                                rsp);
                break;
        case FSCTL_SET_SPARSE:
                if (in_buf_len < sizeof(struct file_sparse)) {
                        ret = -EINVAL;
                        goto out;
                }

                ret = fsctl_set_sparse(work, id,
                                       (struct file_sparse *)&req->Buffer[0]);
                if (ret < 0)
                        goto out;
                break;
        case FSCTL_SET_ZERO_DATA:
        {
                struct file_zero_data_information *zero_data;
                struct ksmbd_file *fp;
                loff_t off, len;

                if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
                        ksmbd_debug(SMB,
                                    "User does not have write permission\n");
                        ret = -EACCES;
                        goto out;
                }

                if (in_buf_len < sizeof(struct file_zero_data_information)) {
                        ret = -EINVAL;
                        goto out;
                }

                zero_data =
                        (struct file_zero_data_information *)&req->Buffer[0];

                fp = ksmbd_lookup_fd_fast(work, id);
                if (!fp) {
                        ret = -ENOENT;
                        goto out;
                }

                off = le64_to_cpu(zero_data->FileOffset);
                len = le64_to_cpu(zero_data->BeyondFinalZero) - off;

                ret = ksmbd_vfs_zero_data(work, fp, off, len);
                ksmbd_fd_put(work, fp);
                if (ret < 0)
                        goto out;
                break;
        }
        case FSCTL_QUERY_ALLOCATED_RANGES:
                if (in_buf_len < sizeof(struct file_allocated_range_buffer)) {
                        ret = -EINVAL;
                        goto out;
                }

                ret = fsctl_query_allocated_ranges(work, id,
                        (struct file_allocated_range_buffer *)&req->Buffer[0],
                        (struct file_allocated_range_buffer *)&rsp->Buffer[0],
                        out_buf_len /
                        sizeof(struct file_allocated_range_buffer), &nbytes);
                if (ret == -E2BIG) {
                        rsp->hdr.Status = STATUS_BUFFER_OVERFLOW;
                } else if (ret < 0) {
                        nbytes = 0;
                        goto out;
                }

                nbytes *= sizeof(struct file_allocated_range_buffer);
                break;
        case FSCTL_GET_REPARSE_POINT:
        {
                struct reparse_data_buffer *reparse_ptr;
                struct ksmbd_file *fp;

                reparse_ptr = (struct reparse_data_buffer *)&rsp->Buffer[0];
                fp = ksmbd_lookup_fd_fast(work, id);
                if (!fp) {
                        pr_err("not found fp!!\n");
                        ret = -ENOENT;
                        goto out;
                }

                reparse_ptr->ReparseTag =
                        smb2_get_reparse_tag_special_file(file_inode(fp->filp)->i_mode);
                reparse_ptr->ReparseDataLength = 0;
                ksmbd_fd_put(work, fp);
                nbytes = sizeof(struct reparse_data_buffer);
                break;
        }
        case FSCTL_DUPLICATE_EXTENTS_TO_FILE:
        {
                struct ksmbd_file *fp_in, *fp_out = NULL;
                struct duplicate_extents_to_file *dup_ext;
                loff_t src_off, dst_off, length, cloned;

                if (in_buf_len < sizeof(struct duplicate_extents_to_file)) {
                        ret = -EINVAL;
                        goto out;
                }

                dup_ext = (struct duplicate_extents_to_file *)&req->Buffer[0];

                fp_in = ksmbd_lookup_fd_slow(work, dup_ext->VolatileFileHandle,
                                             dup_ext->PersistentFileHandle);
                if (!fp_in) {
                        pr_err("not found file handle in duplicate extent to file\n");
                        ret = -ENOENT;
                        goto out;
                }

                fp_out = ksmbd_lookup_fd_fast(work, id);
                if (!fp_out) {
                        pr_err("not found fp\n");
                        ret = -ENOENT;
                        goto dup_ext_out;
                }

                src_off = le64_to_cpu(dup_ext->SourceFileOffset);
                dst_off = le64_to_cpu(dup_ext->TargetFileOffset);
                length = le64_to_cpu(dup_ext->ByteCount);
                cloned = vfs_clone_file_range(fp_in->filp, src_off, fp_out->filp,
                                              dst_off, length, 0);
                if (cloned == -EXDEV || cloned == -EOPNOTSUPP) {
                        ret = -EOPNOTSUPP;
                        goto dup_ext_out;
                } else if (cloned != length) {
                        cloned = vfs_copy_file_range(fp_in->filp, src_off,
                                                     fp_out->filp, dst_off, length, 0);
                        if (cloned != length) {
                                if (cloned < 0)
                                        ret = cloned;
                                else
                                        ret = -EINVAL;
                        }
                }

dup_ext_out:
                ksmbd_fd_put(work, fp_in);
                ksmbd_fd_put(work, fp_out);
                if (ret < 0)
                        goto out;
                break;
        }
        default:
                ksmbd_debug(SMB, "not implemented yet ioctl command 0x%x\n",
                            cnt_code);
                ret = -EOPNOTSUPP;
                goto out;
        }

        rsp->CntCode = cpu_to_le32(cnt_code);
        rsp->InputCount = cpu_to_le32(0);
        rsp->InputOffset = cpu_to_le32(112);
        rsp->OutputOffset = cpu_to_le32(112);
        rsp->OutputCount = cpu_to_le32(nbytes);
        rsp->StructureSize = cpu_to_le16(49);
        rsp->Reserved = cpu_to_le16(0);
        rsp->Flags = cpu_to_le32(0);
        rsp->Reserved2 = cpu_to_le32(0);
        inc_rfc1001_len(rsp_org, 48 + nbytes);

        return 0;

out:
        if (ret == -EACCES)
                rsp->hdr.Status = STATUS_ACCESS_DENIED;
        else if (ret == -ENOENT)
                rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
        else if (ret == -EOPNOTSUPP)
                rsp->hdr.Status = STATUS_NOT_SUPPORTED;
        else if (ret == -ENOSPC)
                rsp->hdr.Status = STATUS_BUFFER_TOO_SMALL;
        else if (ret < 0 || rsp->hdr.Status == 0)
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
        smb2_set_err_rsp(work);
        return 0;
}

/**
 * smb20_oplock_break_ack() - handler for smb2.0 oplock break command
 * @work:       smb work containing oplock break command buffer
 *
 * Return:      0
 */
static void smb20_oplock_break_ack(struct ksmbd_work *work)
{
        struct smb2_oplock_break *req = work->request_buf;
        struct smb2_oplock_break *rsp = work->response_buf;
        struct ksmbd_file *fp;
        struct oplock_info *opinfo = NULL;
        __le32 err = 0;
        int ret = 0;
        u64 volatile_id, persistent_id;
        char req_oplevel = 0, rsp_oplevel = 0;
        unsigned int oplock_change_type;

        volatile_id = le64_to_cpu(req->VolatileFid);
        persistent_id = le64_to_cpu(req->PersistentFid);
        req_oplevel = req->OplockLevel;
        ksmbd_debug(OPLOCK, "v_id %llu, p_id %llu request oplock level %d\n",
                    volatile_id, persistent_id, req_oplevel);

        fp = ksmbd_lookup_fd_slow(work, volatile_id, persistent_id);
        if (!fp) {
                rsp->hdr.Status = STATUS_FILE_CLOSED;
                smb2_set_err_rsp(work);
                return;
        }

        opinfo = opinfo_get(fp);
        if (!opinfo) {
                pr_err("unexpected null oplock_info\n");
                rsp->hdr.Status = STATUS_INVALID_OPLOCK_PROTOCOL;
                smb2_set_err_rsp(work);
                ksmbd_fd_put(work, fp);
                return;
        }

        if (opinfo->level == SMB2_OPLOCK_LEVEL_NONE) {
                rsp->hdr.Status = STATUS_INVALID_OPLOCK_PROTOCOL;
                goto err_out;
        }

        if (opinfo->op_state == OPLOCK_STATE_NONE) {
                ksmbd_debug(SMB, "unexpected oplock state 0x%x\n", opinfo->op_state);
                rsp->hdr.Status = STATUS_UNSUCCESSFUL;
                goto err_out;
        }

        if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
             opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
            (req_oplevel != SMB2_OPLOCK_LEVEL_II &&
             req_oplevel != SMB2_OPLOCK_LEVEL_NONE)) {
                err = STATUS_INVALID_OPLOCK_PROTOCOL;
                oplock_change_type = OPLOCK_WRITE_TO_NONE;
        } else if (opinfo->level == SMB2_OPLOCK_LEVEL_II &&
                   req_oplevel != SMB2_OPLOCK_LEVEL_NONE) {
                err = STATUS_INVALID_OPLOCK_PROTOCOL;
                oplock_change_type = OPLOCK_READ_TO_NONE;
        } else if (req_oplevel == SMB2_OPLOCK_LEVEL_II ||
                   req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
                err = STATUS_INVALID_DEVICE_STATE;
                if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
                     opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
                    req_oplevel == SMB2_OPLOCK_LEVEL_II) {
                        oplock_change_type = OPLOCK_WRITE_TO_READ;
                } else if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
                            opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
                           req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
                        oplock_change_type = OPLOCK_WRITE_TO_NONE;
                } else if (opinfo->level == SMB2_OPLOCK_LEVEL_II &&
                           req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
                        oplock_change_type = OPLOCK_READ_TO_NONE;
                } else {
                        oplock_change_type = 0;
                }
        } else {
                oplock_change_type = 0;
        }

        switch (oplock_change_type) {
        case OPLOCK_WRITE_TO_READ:
                ret = opinfo_write_to_read(opinfo);
                rsp_oplevel = SMB2_OPLOCK_LEVEL_II;
                break;
        case OPLOCK_WRITE_TO_NONE:
                ret = opinfo_write_to_none(opinfo);
                rsp_oplevel = SMB2_OPLOCK_LEVEL_NONE;
                break;
        case OPLOCK_READ_TO_NONE:
                ret = opinfo_read_to_none(opinfo);
                rsp_oplevel = SMB2_OPLOCK_LEVEL_NONE;
                break;
        default:
                pr_err("unknown oplock change 0x%x -> 0x%x\n",
                       opinfo->level, rsp_oplevel);
        }

        if (ret < 0) {
                rsp->hdr.Status = err;
                goto err_out;
        }

        opinfo_put(opinfo);
        ksmbd_fd_put(work, fp);
        opinfo->op_state = OPLOCK_STATE_NONE;
        wake_up_interruptible_all(&opinfo->oplock_q);

        rsp->StructureSize = cpu_to_le16(24);
        rsp->OplockLevel = rsp_oplevel;
        rsp->Reserved = 0;
        rsp->Reserved2 = 0;
        rsp->VolatileFid = cpu_to_le64(volatile_id);
        rsp->PersistentFid = cpu_to_le64(persistent_id);
        inc_rfc1001_len(rsp, 24);
        return;

err_out:
        opinfo->op_state = OPLOCK_STATE_NONE;
        wake_up_interruptible_all(&opinfo->oplock_q);

        opinfo_put(opinfo);
        ksmbd_fd_put(work, fp);
        smb2_set_err_rsp(work);
}

static int check_lease_state(struct lease *lease, __le32 req_state)
{
        if ((lease->new_state ==
             (SMB2_LEASE_READ_CACHING_LE | SMB2_LEASE_HANDLE_CACHING_LE)) &&
            !(req_state & SMB2_LEASE_WRITE_CACHING_LE)) {
                lease->new_state = req_state;
                return 0;
        }

        if (lease->new_state == req_state)
                return 0;

        return 1;
}

/**
 * smb21_lease_break_ack() - handler for smb2.1 lease break command
 * @work:       smb work containing lease break command buffer
 *
 * Return:      0
 */
static void smb21_lease_break_ack(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_lease_ack *req = work->request_buf;
        struct smb2_lease_ack *rsp = work->response_buf;
        struct oplock_info *opinfo;
        __le32 err = 0;
        int ret = 0;
        unsigned int lease_change_type;
        __le32 lease_state;
        struct lease *lease;

        ksmbd_debug(OPLOCK, "smb21 lease break, lease state(0x%x)\n",
                    le32_to_cpu(req->LeaseState));
        opinfo = lookup_lease_in_table(conn, req->LeaseKey);
        if (!opinfo) {
                ksmbd_debug(OPLOCK, "file not opened\n");
                smb2_set_err_rsp(work);
                rsp->hdr.Status = STATUS_UNSUCCESSFUL;
                return;
        }
        lease = opinfo->o_lease;

        if (opinfo->op_state == OPLOCK_STATE_NONE) {
                pr_err("unexpected lease break state 0x%x\n",
                       opinfo->op_state);
                rsp->hdr.Status = STATUS_UNSUCCESSFUL;
                goto err_out;
        }

        if (check_lease_state(lease, req->LeaseState)) {
                rsp->hdr.Status = STATUS_REQUEST_NOT_ACCEPTED;
                ksmbd_debug(OPLOCK,
                            "req lease state: 0x%x, expected state: 0x%x\n",
                            req->LeaseState, lease->new_state);
                goto err_out;
        }

        if (!atomic_read(&opinfo->breaking_cnt)) {
                rsp->hdr.Status = STATUS_UNSUCCESSFUL;
                goto err_out;
        }

        /* check for bad lease state */
        if (req->LeaseState &
            (~(SMB2_LEASE_READ_CACHING_LE | SMB2_LEASE_HANDLE_CACHING_LE))) {
                err = STATUS_INVALID_OPLOCK_PROTOCOL;
                if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
                        lease_change_type = OPLOCK_WRITE_TO_NONE;
                else
                        lease_change_type = OPLOCK_READ_TO_NONE;
                ksmbd_debug(OPLOCK, "handle bad lease state 0x%x -> 0x%x\n",
                            le32_to_cpu(lease->state),
                            le32_to_cpu(req->LeaseState));
        } else if (lease->state == SMB2_LEASE_READ_CACHING_LE &&
                   req->LeaseState != SMB2_LEASE_NONE_LE) {
                err = STATUS_INVALID_OPLOCK_PROTOCOL;
                lease_change_type = OPLOCK_READ_TO_NONE;
                ksmbd_debug(OPLOCK, "handle bad lease state 0x%x -> 0x%x\n",
                            le32_to_cpu(lease->state),
                            le32_to_cpu(req->LeaseState));
        } else {
                /* valid lease state changes */
                err = STATUS_INVALID_DEVICE_STATE;
                if (req->LeaseState == SMB2_LEASE_NONE_LE) {
                        if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
                                lease_change_type = OPLOCK_WRITE_TO_NONE;
                        else
                                lease_change_type = OPLOCK_READ_TO_NONE;
                } else if (req->LeaseState & SMB2_LEASE_READ_CACHING_LE) {
                        if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
                                lease_change_type = OPLOCK_WRITE_TO_READ;
                        else
                                lease_change_type = OPLOCK_READ_HANDLE_TO_READ;
                } else {
                        lease_change_type = 0;
                }
        }

        switch (lease_change_type) {
        case OPLOCK_WRITE_TO_READ:
                ret = opinfo_write_to_read(opinfo);
                break;
        case OPLOCK_READ_HANDLE_TO_READ:
                ret = opinfo_read_handle_to_read(opinfo);
                break;
        case OPLOCK_WRITE_TO_NONE:
                ret = opinfo_write_to_none(opinfo);
                break;
        case OPLOCK_READ_TO_NONE:
                ret = opinfo_read_to_none(opinfo);
                break;
        default:
                ksmbd_debug(OPLOCK, "unknown lease change 0x%x -> 0x%x\n",
                            le32_to_cpu(lease->state),
                            le32_to_cpu(req->LeaseState));
        }

        lease_state = lease->state;
        opinfo->op_state = OPLOCK_STATE_NONE;
        wake_up_interruptible_all(&opinfo->oplock_q);
        atomic_dec(&opinfo->breaking_cnt);
        wake_up_interruptible_all(&opinfo->oplock_brk);
        opinfo_put(opinfo);

        if (ret < 0) {
                rsp->hdr.Status = err;
                goto err_out;
        }

        rsp->StructureSize = cpu_to_le16(36);
        rsp->Reserved = 0;
        rsp->Flags = 0;
        memcpy(rsp->LeaseKey, req->LeaseKey, 16);
        rsp->LeaseState = lease_state;
        rsp->LeaseDuration = 0;
        inc_rfc1001_len(rsp, 36);
        return;

err_out:
        opinfo->op_state = OPLOCK_STATE_NONE;
        wake_up_interruptible_all(&opinfo->oplock_q);
        atomic_dec(&opinfo->breaking_cnt);
        wake_up_interruptible_all(&opinfo->oplock_brk);

        opinfo_put(opinfo);
        smb2_set_err_rsp(work);
}

/**
 * smb2_oplock_break() - dispatcher for smb2.0 and 2.1 oplock/lease break
 * @work:       smb work containing oplock/lease break command buffer
 *
 * Return:      0
 */
int smb2_oplock_break(struct ksmbd_work *work)
{
        struct smb2_oplock_break *req = work->request_buf;
        struct smb2_oplock_break *rsp = work->response_buf;

        switch (le16_to_cpu(req->StructureSize)) {
        case OP_BREAK_STRUCT_SIZE_20:
                smb20_oplock_break_ack(work);
                break;
        case OP_BREAK_STRUCT_SIZE_21:
                smb21_lease_break_ack(work);
                break;
        default:
                ksmbd_debug(OPLOCK, "invalid break cmd %d\n",
                            le16_to_cpu(req->StructureSize));
                rsp->hdr.Status = STATUS_INVALID_PARAMETER;
                smb2_set_err_rsp(work);
        }

        return 0;
}

/**
 * smb2_notify() - handler for smb2 notify request
 * @work:   smb work containing notify command buffer
 *
 * Return:      0
 */
int smb2_notify(struct ksmbd_work *work)
{
        struct smb2_notify_req *req;
        struct smb2_notify_rsp *rsp;

        WORK_BUFFERS(work, req, rsp);

        if (work->next_smb2_rcv_hdr_off && req->hdr.NextCommand) {
                rsp->hdr.Status = STATUS_INTERNAL_ERROR;
                smb2_set_err_rsp(work);
                return 0;
        }

        smb2_set_err_rsp(work);
        rsp->hdr.Status = STATUS_NOT_IMPLEMENTED;
        return 0;
}

/**
 * smb2_is_sign_req() - handler for checking packet signing status
 * @work:       smb work containing notify command buffer
 * @command:    SMB2 command id
 *
 * Return:      true if packed is signed, false otherwise
 */
bool smb2_is_sign_req(struct ksmbd_work *work, unsigned int command)
{
        struct smb2_hdr *rcv_hdr2 = work->request_buf;

        if ((rcv_hdr2->Flags & SMB2_FLAGS_SIGNED) &&
            command != SMB2_NEGOTIATE_HE &&
            command != SMB2_SESSION_SETUP_HE &&
            command != SMB2_OPLOCK_BREAK_HE)
                return true;

        return false;
}

/**
 * smb2_check_sign_req() - handler for req packet sign processing
 * @work:   smb work containing notify command buffer
 *
 * Return:      1 on success, 0 otherwise
 */
int smb2_check_sign_req(struct ksmbd_work *work)
{
        struct smb2_hdr *hdr, *hdr_org;
        char signature_req[SMB2_SIGNATURE_SIZE];
        char signature[SMB2_HMACSHA256_SIZE];
        struct kvec iov[1];
        size_t len;

        hdr_org = hdr = work->request_buf;
        if (work->next_smb2_rcv_hdr_off)
                hdr = ksmbd_req_buf_next(work);

        if (!hdr->NextCommand && !work->next_smb2_rcv_hdr_off)
                len = be32_to_cpu(hdr_org->smb2_buf_length);
        else if (hdr->NextCommand)
                len = le32_to_cpu(hdr->NextCommand);
        else
                len = be32_to_cpu(hdr_org->smb2_buf_length) -
                        work->next_smb2_rcv_hdr_off;

        memcpy(signature_req, hdr->Signature, SMB2_SIGNATURE_SIZE);
        memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);

        iov[0].iov_base = (char *)&hdr->ProtocolId;
        iov[0].iov_len = len;

        if (ksmbd_sign_smb2_pdu(work->conn, work->sess->sess_key, iov, 1,
                                signature))
                return 0;

        if (memcmp(signature, signature_req, SMB2_SIGNATURE_SIZE)) {
                pr_err("bad smb2 signature\n");
                return 0;
        }

        return 1;
}

/**
 * smb2_set_sign_rsp() - handler for rsp packet sign processing
 * @work:   smb work containing notify command buffer
 *
 */
void smb2_set_sign_rsp(struct ksmbd_work *work)
{
        struct smb2_hdr *hdr, *hdr_org;
        struct smb2_hdr *req_hdr;
        char signature[SMB2_HMACSHA256_SIZE];
        struct kvec iov[2];
        size_t len;
        int n_vec = 1;

        hdr_org = hdr = work->response_buf;
        if (work->next_smb2_rsp_hdr_off)
                hdr = ksmbd_resp_buf_next(work);

        req_hdr = ksmbd_req_buf_next(work);

        if (!work->next_smb2_rsp_hdr_off) {
                len = get_rfc1002_len(hdr_org);
                if (req_hdr->NextCommand)
                        len = ALIGN(len, 8);
        } else {
                len = get_rfc1002_len(hdr_org) - work->next_smb2_rsp_hdr_off;
                len = ALIGN(len, 8);
        }

        if (req_hdr->NextCommand)
                hdr->NextCommand = cpu_to_le32(len);

        hdr->Flags |= SMB2_FLAGS_SIGNED;
        memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);

        iov[0].iov_base = (char *)&hdr->ProtocolId;
        iov[0].iov_len = len;

        if (work->aux_payload_sz) {
                iov[0].iov_len -= work->aux_payload_sz;

                iov[1].iov_base = work->aux_payload_buf;
                iov[1].iov_len = work->aux_payload_sz;
                n_vec++;
        }

        if (!ksmbd_sign_smb2_pdu(work->conn, work->sess->sess_key, iov, n_vec,
                                 signature))
                memcpy(hdr->Signature, signature, SMB2_SIGNATURE_SIZE);
}

/**
 * smb3_check_sign_req() - handler for req packet sign processing
 * @work:   smb work containing notify command buffer
 *
 * Return:      1 on success, 0 otherwise
 */
int smb3_check_sign_req(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        char *signing_key;
        struct smb2_hdr *hdr, *hdr_org;
        struct channel *chann;
        char signature_req[SMB2_SIGNATURE_SIZE];
        char signature[SMB2_CMACAES_SIZE];
        struct kvec iov[1];
        size_t len;

        hdr_org = hdr = work->request_buf;
        if (work->next_smb2_rcv_hdr_off)
                hdr = ksmbd_req_buf_next(work);

        if (!hdr->NextCommand && !work->next_smb2_rcv_hdr_off)
                len = be32_to_cpu(hdr_org->smb2_buf_length);
        else if (hdr->NextCommand)
                len = le32_to_cpu(hdr->NextCommand);
        else
                len = be32_to_cpu(hdr_org->smb2_buf_length) -
                        work->next_smb2_rcv_hdr_off;

        if (le16_to_cpu(hdr->Command) == SMB2_SESSION_SETUP_HE) {
                signing_key = work->sess->smb3signingkey;
        } else {
                chann = lookup_chann_list(work->sess, conn);
                if (!chann)
                        return 0;
                signing_key = chann->smb3signingkey;
        }

        if (!signing_key) {
                pr_err("SMB3 signing key is not generated\n");
                return 0;
        }

        memcpy(signature_req, hdr->Signature, SMB2_SIGNATURE_SIZE);
        memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
        iov[0].iov_base = (char *)&hdr->ProtocolId;
        iov[0].iov_len = len;

        if (ksmbd_sign_smb3_pdu(conn, signing_key, iov, 1, signature))
                return 0;

        if (memcmp(signature, signature_req, SMB2_SIGNATURE_SIZE)) {
                pr_err("bad smb2 signature\n");
                return 0;
        }

        return 1;
}

/**
 * smb3_set_sign_rsp() - handler for rsp packet sign processing
 * @work:   smb work containing notify command buffer
 *
 */
void smb3_set_sign_rsp(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_hdr *req_hdr;
        struct smb2_hdr *hdr, *hdr_org;
        struct channel *chann;
        char signature[SMB2_CMACAES_SIZE];
        struct kvec iov[2];
        int n_vec = 1;
        size_t len;
        char *signing_key;

        hdr_org = hdr = work->response_buf;
        if (work->next_smb2_rsp_hdr_off)
                hdr = ksmbd_resp_buf_next(work);

        req_hdr = ksmbd_req_buf_next(work);

        if (!work->next_smb2_rsp_hdr_off) {
                len = get_rfc1002_len(hdr_org);
                if (req_hdr->NextCommand)
                        len = ALIGN(len, 8);
        } else {
                len = get_rfc1002_len(hdr_org) - work->next_smb2_rsp_hdr_off;
                len = ALIGN(len, 8);
        }

        if (conn->binding == false &&
            le16_to_cpu(hdr->Command) == SMB2_SESSION_SETUP_HE) {
                signing_key = work->sess->smb3signingkey;
        } else {
                chann = lookup_chann_list(work->sess, work->conn);
                if (!chann)
                        return;
                signing_key = chann->smb3signingkey;
        }

        if (!signing_key)
                return;

        if (req_hdr->NextCommand)
                hdr->NextCommand = cpu_to_le32(len);

        hdr->Flags |= SMB2_FLAGS_SIGNED;
        memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
        iov[0].iov_base = (char *)&hdr->ProtocolId;
        iov[0].iov_len = len;
        if (work->aux_payload_sz) {
                iov[0].iov_len -= work->aux_payload_sz;
                iov[1].iov_base = work->aux_payload_buf;
                iov[1].iov_len = work->aux_payload_sz;
                n_vec++;
        }

        if (!ksmbd_sign_smb3_pdu(conn, signing_key, iov, n_vec, signature))
                memcpy(hdr->Signature, signature, SMB2_SIGNATURE_SIZE);
}

/**
 * smb3_preauth_hash_rsp() - handler for computing preauth hash on response
 * @work:   smb work containing response buffer
 *
 */
void smb3_preauth_hash_rsp(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct ksmbd_session *sess = work->sess;
        struct smb2_hdr *req, *rsp;

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

        WORK_BUFFERS(work, req, rsp);

        if (le16_to_cpu(req->Command) == SMB2_NEGOTIATE_HE &&
            conn->preauth_info)
                ksmbd_gen_preauth_integrity_hash(conn, (char *)rsp,
                                                 conn->preauth_info->Preauth_HashValue);

        if (le16_to_cpu(rsp->Command) == SMB2_SESSION_SETUP_HE && sess) {
                __u8 *hash_value;

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

                        preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
                        if (!preauth_sess)
                                return;
                        hash_value = preauth_sess->Preauth_HashValue;
                } else {
                        hash_value = sess->Preauth_HashValue;
                        if (!hash_value)
                                return;
                }
                ksmbd_gen_preauth_integrity_hash(conn, (char *)rsp,
                                                 hash_value);
        }
}

static void fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, char *old_buf,
                               __le16 cipher_type)
{
        struct smb2_hdr *hdr = (struct smb2_hdr *)old_buf;
        unsigned int orig_len = get_rfc1002_len(old_buf);

        memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
        tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
        tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
        tr_hdr->Flags = cpu_to_le16(0x01);
        if (cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
            cipher_type == SMB2_ENCRYPTION_AES256_GCM)
                get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
        else
                get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
        memcpy(&tr_hdr->SessionId, &hdr->SessionId, 8);
        inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - 4);
        inc_rfc1001_len(tr_hdr, orig_len);
}

int smb3_encrypt_resp(struct ksmbd_work *work)
{
        char *buf = work->response_buf;
        struct smb2_transform_hdr *tr_hdr;
        struct kvec iov[3];
        int rc = -ENOMEM;
        int buf_size = 0, rq_nvec = 2 + (work->aux_payload_sz ? 1 : 0);

        if (ARRAY_SIZE(iov) < rq_nvec)
                return -ENOMEM;

        tr_hdr = kzalloc(sizeof(struct smb2_transform_hdr), GFP_KERNEL);
        if (!tr_hdr)
                return rc;

        /* fill transform header */
        fill_transform_hdr(tr_hdr, buf, work->conn->cipher_type);

        iov[0].iov_base = tr_hdr;
        iov[0].iov_len = sizeof(struct smb2_transform_hdr);
        buf_size += iov[0].iov_len - 4;

        iov[1].iov_base = buf + 4;
        iov[1].iov_len = get_rfc1002_len(buf);
        if (work->aux_payload_sz) {
                iov[1].iov_len = work->resp_hdr_sz - 4;

                iov[2].iov_base = work->aux_payload_buf;
                iov[2].iov_len = work->aux_payload_sz;
                buf_size += iov[2].iov_len;
        }
        buf_size += iov[1].iov_len;
        work->resp_hdr_sz = iov[1].iov_len;

        rc = ksmbd_crypt_message(work->conn, iov, rq_nvec, 1);
        if (rc)
                return rc;

        memmove(buf, iov[1].iov_base, iov[1].iov_len);
        tr_hdr->smb2_buf_length = cpu_to_be32(buf_size);
        work->tr_buf = tr_hdr;

        return rc;
}

bool smb3_is_transform_hdr(void *buf)
{
        struct smb2_transform_hdr *trhdr = buf;

        return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
}

int smb3_decrypt_req(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct ksmbd_session *sess;
        char *buf = work->request_buf;
        struct smb2_hdr *hdr;
        unsigned int pdu_length = get_rfc1002_len(buf);
        struct kvec iov[2];
        int buf_data_size = pdu_length + 4 -
                sizeof(struct smb2_transform_hdr);
        struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
        int rc = 0;

        if (buf_data_size < sizeof(struct smb2_hdr)) {
                pr_err("Transform message is too small (%u)\n",
                       pdu_length);
                return -ECONNABORTED;
        }

        if (buf_data_size < le32_to_cpu(tr_hdr->OriginalMessageSize)) {
                pr_err("Transform message is broken\n");
                return -ECONNABORTED;
        }

        sess = ksmbd_session_lookup_all(conn, le64_to_cpu(tr_hdr->SessionId));
        if (!sess) {
                pr_err("invalid session id(%llx) in transform header\n",
                       le64_to_cpu(tr_hdr->SessionId));
                return -ECONNABORTED;
        }

        iov[0].iov_base = buf;
        iov[0].iov_len = sizeof(struct smb2_transform_hdr);
        iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
        iov[1].iov_len = buf_data_size;
        rc = ksmbd_crypt_message(conn, iov, 2, 0);
        if (rc)
                return rc;

        memmove(buf + 4, iov[1].iov_base, buf_data_size);
        hdr = (struct smb2_hdr *)buf;
        hdr->smb2_buf_length = cpu_to_be32(buf_data_size);

        return rc;
}

bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work)
{
        struct ksmbd_conn *conn = work->conn;
        struct smb2_hdr *rsp = work->response_buf;

        if (conn->dialect < SMB30_PROT_ID)
                return false;

        if (work->next_smb2_rcv_hdr_off)
                rsp = ksmbd_resp_buf_next(work);

        if (le16_to_cpu(rsp->Command) == SMB2_SESSION_SETUP_HE &&
            rsp->Status == STATUS_SUCCESS)
                return true;
        return false;
}