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/*

 *   fs/cifs/misc.c

 *

 *   Copyright (C) International Business Machines  Corp., 2002,2007

 *   Author(s): Steve French (sfrench@us.ibm.com)

 *

 *   This library is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU Lesser General Public License as published

 *   by the Free Software Foundation; either version 2.1 of the License, or

 *   (at your option) any later version.

 *

 *   This library is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See

 *   the GNU Lesser General Public License for more details.

 *

 *   You should have received a copy of the GNU Lesser General Public License

 *   along with this library; if not, write to the Free Software

 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

#include <linux/slab.h>

#include <linux/ctype.h>

#include <linux/mempool.h>

#include "cifspdu.h"

#include "cifsglob.h"

#include "cifsproto.h"

#include "cifs_debug.h"

#include "smberr.h"

#include "nterr.h"

#include "cifs_unicode.h"

extern mempool_t *cifs_sm_req_poolp;

extern mempool_t *cifs_req_poolp;

extern struct task_struct *oplockThread;

/* The xid serves as a useful identifier for each incoming vfs request,

   in a similar way to the mid which is useful to track each sent smb,

   and CurrentXid can also provide a running counter (although it

   will eventually wrap past zero) of the total vfs operations handled

   since the cifs fs was mounted */

unsigned int

_GetXid(void)

{

        unsigned int xid;

        spin_lock(&GlobalMid_Lock);

        GlobalTotalActiveXid++;

        /* keep high water mark for number of simultaneous ops in filesystem */

        if (GlobalTotalActiveXid > GlobalMaxActiveXid)

                GlobalMaxActiveXid = GlobalTotalActiveXid;

        if (GlobalTotalActiveXid > 65000)

                cFYI(1, ("warning: more than 65000 requests active"));

        xid = GlobalCurrentXid++;

        spin_unlock(&GlobalMid_Lock);

        return xid;

}

void

_FreeXid(unsigned int xid)

{

        spin_lock(&GlobalMid_Lock);

        /* if (GlobalTotalActiveXid == 0)

                BUG(); */

        GlobalTotalActiveXid--;

        spin_unlock(&GlobalMid_Lock);

}

struct cifsSesInfo *

sesInfoAlloc(void)

{

        struct cifsSesInfo *ret_buf;

        ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL);

        if (ret_buf) {

                write_lock(&GlobalSMBSeslock);

                atomic_inc(&sesInfoAllocCount);

                ret_buf->status = CifsNew;

                list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);

                init_MUTEX(&ret_buf->sesSem);

                write_unlock(&GlobalSMBSeslock);

        }

        return ret_buf;

}

void

sesInfoFree(struct cifsSesInfo *buf_to_free)

{

        if (buf_to_free == NULL) {

                cFYI(1, ("Null buffer passed to sesInfoFree"));

                return;

        }

        write_lock(&GlobalSMBSeslock);

        atomic_dec(&sesInfoAllocCount);

        list_del(&buf_to_free->cifsSessionList);

        write_unlock(&GlobalSMBSeslock);

        kfree(buf_to_free->serverOS);

        kfree(buf_to_free->serverDomain);

        kfree(buf_to_free->serverNOS);

        kfree(buf_to_free->password);

        kfree(buf_to_free->domainName);

        kfree(buf_to_free);

}

struct cifsTconInfo *

tconInfoAlloc(void)

{

        struct cifsTconInfo *ret_buf;

        ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL);

        if (ret_buf) {

                write_lock(&GlobalSMBSeslock);

                atomic_inc(&tconInfoAllocCount);

                list_add(&ret_buf->cifsConnectionList,

                         &GlobalTreeConnectionList);

                ret_buf->tidStatus = CifsNew;

                INIT_LIST_HEAD(&ret_buf->openFileList);

                init_MUTEX(&ret_buf->tconSem);

#ifdef CONFIG_CIFS_STATS

                spin_lock_init(&ret_buf->stat_lock);

#endif

                write_unlock(&GlobalSMBSeslock);

        }

        return ret_buf;

}

void

tconInfoFree(struct cifsTconInfo *buf_to_free)

{

        if (buf_to_free == NULL) {

                cFYI(1, ("Null buffer passed to tconInfoFree"));

                return;

        }

        write_lock(&GlobalSMBSeslock);

        atomic_dec(&tconInfoAllocCount);

        list_del(&buf_to_free->cifsConnectionList);

        write_unlock(&GlobalSMBSeslock);

        kfree(buf_to_free->nativeFileSystem);

        kfree(buf_to_free);

}

struct smb_hdr *

cifs_buf_get(void)

{

        struct smb_hdr *ret_buf = NULL;

/* We could use negotiated size instead of max_msgsize -

   but it may be more efficient to always alloc same size

   albeit slightly larger than necessary and maxbuffersize

   defaults to this and can not be bigger */

        ret_buf = (struct smb_hdr *) mempool_alloc(cifs_req_poolp,

                                                   GFP_KERNEL | GFP_NOFS);

        /* clear the first few header bytes */

        /* for most paths, more is cleared in header_assemble */

        if (ret_buf) {

                memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);

                atomic_inc(&bufAllocCount);

#ifdef CONFIG_CIFS_STATS2

                atomic_inc(&totBufAllocCount);

#endif /* CONFIG_CIFS_STATS2 */

        }

        return ret_buf;

}

void

cifs_buf_release(void *buf_to_free)

{

        if (buf_to_free == NULL) {

                /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/

                return;

        }

        mempool_free(buf_to_free, cifs_req_poolp);

        atomic_dec(&bufAllocCount);

        return;

}

struct smb_hdr *

cifs_small_buf_get(void)

{

        struct smb_hdr *ret_buf = NULL;

/* We could use negotiated size instead of max_msgsize -

   but it may be more efficient to always alloc same size

   albeit slightly larger than necessary and maxbuffersize

   defaults to this and can not be bigger */

        ret_buf = (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp,

                                                   GFP_KERNEL | GFP_NOFS);

        if (ret_buf) {

        /* No need to clear memory here, cleared in header assemble */

        /*      memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/

                atomic_inc(&smBufAllocCount);

#ifdef CONFIG_CIFS_STATS2

                atomic_inc(&totSmBufAllocCount);

#endif /* CONFIG_CIFS_STATS2 */

        }

        return ret_buf;

}

void

cifs_small_buf_release(void *buf_to_free)

{

        if (buf_to_free == NULL) {

                cFYI(1, ("Null buffer passed to cifs_small_buf_release"));

                return;

        }

        mempool_free(buf_to_free, cifs_sm_req_poolp);

        atomic_dec(&smBufAllocCount);

        return;

}

/*

        Find a free multiplex id (SMB mid). Otherwise there could be

        mid collisions which might cause problems, demultiplexing the

        wrong response to this request. Multiplex ids could collide if

        one of a series requests takes much longer than the others, or

        if a very large number of long lived requests (byte range

        locks or FindNotify requests) are pending.  No more than

        64K-1 requests can be outstanding at one time.  If no

        mids are available, return zero.  A future optimization

        could make the combination of mids and uid the key we use

        to demultiplex on (rather than mid alone).

        In addition to the above check, the cifs demultiplex

        code already used the command code as a secondary

        check of the frame and if signing is negotiated the

        response would be discarded if the mid were the same

        but the signature was wrong.  Since the mid is not put in the

        pending queue until later (when it is about to be dispatched)

        we do have to limit the number of outstanding requests

        to somewhat less than 64K-1 although it is hard to imagine

        so many threads being in the vfs at one time.

*/

__u16 GetNextMid(struct TCP_Server_Info *server)

{

        __u16 mid = 0;

        __u16 last_mid;

        int   collision;

        if (server == NULL)

                return mid;

        spin_lock(&GlobalMid_Lock);

        last_mid = server->CurrentMid; /* we do not want to loop forever */

        server->CurrentMid++;

        /* This nested loop looks more expensive than it is.

        In practice the list of pending requests is short,

        fewer than 50, and the mids are likely to be unique

        on the first pass through the loop unless some request

        takes longer than the 64 thousand requests before it

        (and it would also have to have been a request that

         did not time out) */

        while (server->CurrentMid != last_mid) {

                struct list_head *tmp;

                struct mid_q_entry *mid_entry;

                collision = 0;

                if (server->CurrentMid == 0)

                        server->CurrentMid++;

                list_for_each(tmp, &server->pending_mid_q) {

                        mid_entry = list_entry(tmp, struct mid_q_entry, qhead);

                        if ((mid_entry->mid == server->CurrentMid) &&

                            (mid_entry->midState == MID_REQUEST_SUBMITTED)) {

                                /* This mid is in use, try a different one */

                                collision = 1;

                                break;

                        }

                }

                if (collision == 0) {

                        mid = server->CurrentMid;

                        break;

                }

                server->CurrentMid++;

        }

        spin_unlock(&GlobalMid_Lock);

        return mid;

}

/* NB: MID can not be set if treeCon not passed in, in that

   case it is responsbility of caller to set the mid */

void

header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,

                const struct cifsTconInfo *treeCon, int word_count

                /* length of fixed section (word count) in two byte units  */)

{

        struct list_head *temp_item;

        struct cifsSesInfo *ses;

        char *temp = (char *) buffer;

        memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */

        buffer->smb_buf_length =

            (2 * word_count) + sizeof(struct smb_hdr) -

            4 /*  RFC 1001 length field does not count */  +

            2 /* for bcc field itself */ ;

        /* Note that this is the only network field that has to be converted

           to big endian and it is done just before we send it */

        buffer->Protocol[0] = 0xFF;

        buffer->Protocol[1] = 'S';

        buffer->Protocol[2] = 'M';

        buffer->Protocol[3] = 'B';

        buffer->Command = smb_command;

        buffer->Flags = 0x00;   /* case sensitive */

        buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;

        buffer->Pid = cpu_to_le16((__u16)current->tgid);

        buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));

        spin_lock(&GlobalMid_Lock);

        spin_unlock(&GlobalMid_Lock);

        if (treeCon) {

                buffer->Tid = treeCon->tid;

                if (treeCon->ses) {

                        if (treeCon->ses->capabilities & CAP_UNICODE)

                                buffer->Flags2 |= SMBFLG2_UNICODE;

                        if (treeCon->ses->capabilities & CAP_STATUS32) {

                                buffer->Flags2 |= SMBFLG2_ERR_STATUS;

                        }

                        /* Uid is not converted */

                        buffer->Uid = treeCon->ses->Suid;

                        buffer->Mid = GetNextMid(treeCon->ses->server);

                        if (multiuser_mount != 0) {

                /* For the multiuser case, there are few obvious technically  */

                /* possible mechanisms to match the local linux user (uid)    */

                /* to a valid remote smb user (smb_uid):                      */

                /*      1) Query Winbind (or other local pam/nss daemon       */

                /*        for userid/password/logon_domain or credential      */

                /*      2) Query Winbind for uid to sid to username mapping   */

                /*         and see if we have a matching password for existing*/

                /*         session for that user perhas getting password by   */

                /*         adding a new pam_cifs module that stores passwords */

                /*         so that the cifs vfs can get at that for all logged*/

                /*         on users                                           */

                /*      3) (Which is the mechanism we have chosen)            */

                /*         Search through sessions to the same server for a   */

                /*         a match on the uid that was passed in on mount     */

                /*         with the current processes uid (or euid?) and use  */

                /*         that smb uid.   If no existing smb session for     */

                /*         that uid found, use the default smb session ie     */

                /*         the smb session for the volume mounted which is    */

                /*         the same as would be used if the multiuser mount   */

                /*         flag were disabled.  */

                /*  BB Add support for establishing new tCon and SMB Session  */

                /*      with userid/password pairs found on the smb session   */

                /*      for other target tcp/ip addresses               BB    */

                                if (current->fsuid != treeCon->ses->linux_uid) {

                                        cFYI(1, ("Multiuser mode and UID "

                                                 "did not match tcon uid"));

                                        read_lock(&GlobalSMBSeslock);

                                        list_for_each(temp_item, &GlobalSMBSessionList) {

                                                ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);

                                                if (ses->linux_uid == current->fsuid) {

                                                        if (ses->server == treeCon->ses->server) {

                                                                cFYI(1, ("found matching uid substitute right smb_uid"));

                                                                buffer->Uid = ses->Suid;

                                                                break;

                                                        } else {

                                /* BB eventually call cifs_setup_session here */

                                                                cFYI(1, ("local UID found but no smb sess with this server exists"));

                                                        }

                                                }

                                        }

                                        read_unlock(&GlobalSMBSeslock);

                                }

                        }

                }

                if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)

                        buffer->Flags2 |= SMBFLG2_DFS;

                if (treeCon->nocase)

                        buffer->Flags  |= SMBFLG_CASELESS;

                if ((treeCon->ses) && (treeCon->ses->server))

                        if (treeCon->ses->server->secMode &

                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))

                                buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

        }

/*  endian conversion of flags is now done just before sending */

        buffer->WordCount = (char) word_count;

        return;

}

static int

checkSMBhdr(struct smb_hdr *smb, __u16 mid)

{

        /* Make sure that this really is an SMB, that it is a response,

           and that the message ids match */

        if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&

                (mid == smb->Mid)) {

                if (smb->Flags & SMBFLG_RESPONSE)

                        return 0;

                else {

                /* only one valid case where server sends us request */

                        if (smb->Command == SMB_COM_LOCKING_ANDX)

                                return 0;

                        else

                                cERROR(1, ("Received Request not response"));

                }

        } else { /* bad signature or mid */

                if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))

                        cERROR(1,

                               ("Bad protocol string signature header %x",

                                *(unsigned int *) smb->Protocol));

                if (mid != smb->Mid)

                        cERROR(1, ("Mids do not match"));

        }

        cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));

        return 1;

}

int

checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)

{

        __u32 len = smb->smb_buf_length;

        __u32 clc_len;  /* calculated length */

        cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));

        if (length < 2 + sizeof(struct smb_hdr)) {

                if ((length >= sizeof(struct smb_hdr) - 1)

                            && (smb->Status.CifsError != 0)) {

                        smb->WordCount = 0;

                        /* some error cases do not return wct and bcc */

                        return 0;

                } else if ((length == sizeof(struct smb_hdr) + 1) &&

                                (smb->WordCount == 0)) {

                        char *tmp = (char *)smb;

                        /* Need to work around a bug in two servers here */

                        /* First, check if the part of bcc they sent was zero */

                        if (tmp[sizeof(struct smb_hdr)] == 0) {

                                /* some servers return only half of bcc

                                 * on simple responses (wct, bcc both zero)

                                 * in particular have seen this on

                                 * ulogoffX and FindClose. This leaves

                                 * one byte of bcc potentially unitialized

                                 */

                                /* zero rest of bcc */

                                tmp[sizeof(struct smb_hdr)+1] = 0;

                                return 0;

                        }

                        cERROR(1, ("rcvd invalid byte count (bcc)"));

                } else {

                        cERROR(1, ("Length less than smb header size"));

                }

                return 1;

        }

        if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {

                cERROR(1, ("smb length greater than MaxBufSize, mid=%d",

                                   smb->Mid));

                return 1;

        }

        if (checkSMBhdr(smb, mid))

                return 1;

        clc_len = smbCalcSize_LE(smb);

        if (4 + len != length) {

                cERROR(1, ("Length read does not match RFC1001 length %d",

                           len));

                return 1;

        }

        if (4 + len != clc_len) {

                /* check if bcc wrapped around for large read responses */

                if ((len > 64 * 1024) && (len > clc_len)) {

                        /* check if lengths match mod 64K */

                        if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))

                                return 0; /* bcc wrapped */

                }

                cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",

                                clc_len, 4 + len, smb->Mid));

                /* Windows XP can return a few bytes too much, presumably

                an illegal pad, at the end of byte range lock responses

                so we allow for that three byte pad, as long as actual

                received length is as long or longer than calculated length */

                /* We have now had to extend this more, since there is a

                case in which it needs to be bigger still to handle a

                malformed response to transact2 findfirst from WinXP when

                access denied is returned and thus bcc and wct are zero

                but server says length is 0x21 bytes too long as if the server

                forget to reset the smb rfc1001 length when it reset the

                wct and bcc to minimum size and drop the t2 parms and data */

                if ((4+len > clc_len) && (len <= clc_len + 512))

                        return 0;

                else {

                        cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",

                                        len, smb->Mid));

                        return 1;

                }

        }

        return 0;

}

int

is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)

{

        struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;

        struct list_head *tmp;

        struct list_head *tmp1;

        struct cifsTconInfo *tcon;

        struct cifsFileInfo *netfile;

        cFYI(1, ("Checking for oplock break or dnotify response"));

        if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&

           (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {

                struct smb_com_transaction_change_notify_rsp *pSMBr =

                        (struct smb_com_transaction_change_notify_rsp *)buf;

                struct file_notify_information *pnotify;

                __u32 data_offset = 0;

                if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {

                        data_offset = le32_to_cpu(pSMBr->DataOffset);

                        pnotify = (struct file_notify_information *)

                                ((char *)&pSMBr->hdr.Protocol + data_offset);

                        cFYI(1, ("dnotify on %s Action: 0x%x",

                                 pnotify->FileName,

                                pnotify->Action));  /* BB removeme BB */

                        /*   cifs_dump_mem("Rcvd notify Data: ",buf,

                                sizeof(struct smb_hdr)+60); */

                        return TRUE;

                }

                if (pSMBr->hdr.Status.CifsError) {

                        cFYI(1, ("notify err 0x%d",

                                pSMBr->hdr.Status.CifsError));

                        return TRUE;

                }

                return FALSE;

        }

        if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)

                return FALSE;

        if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {

                /* no sense logging error on invalid handle on oplock

                   break - harmless race between close request and oplock

                   break response is expected from time to time writing out

                   large dirty files cached on the client */

                if ((NT_STATUS_INVALID_HANDLE) ==

                   le32_to_cpu(pSMB->hdr.Status.CifsError)) {

                        cFYI(1, ("invalid handle on oplock break"));

                        return TRUE;

                } else if (ERRbadfid ==

                   le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {

                        return TRUE;

                } else {

                        return FALSE; /* on valid oplock brk we get "request" */

                }

        }

        if (pSMB->hdr.WordCount != 8)

                return FALSE;

        cFYI(1, ("oplock type 0x%d level 0x%d",

                 pSMB->LockType, pSMB->OplockLevel));

        if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))

                return FALSE;

        /* look up tcon based on tid & uid */

        read_lock(&GlobalSMBSeslock);

        list_for_each(tmp, &GlobalTreeConnectionList) {

                tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);

                if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {

                        cifs_stats_inc(&tcon->num_oplock_brks);

                        list_for_each(tmp1, &tcon->openFileList) {

                                netfile = list_entry(tmp1, struct cifsFileInfo,

                                                     tlist);

                                if (pSMB->Fid == netfile->netfid) {

                                        struct cifsInodeInfo *pCifsInode;

                                        read_unlock(&GlobalSMBSeslock);

                                        cFYI(1,

                                            ("file id match, oplock break"));

                                        pCifsInode =

                                                CIFS_I(netfile->pInode);

                                        pCifsInode->clientCanCacheAll = FALSE;

                                        if (pSMB->OplockLevel == 0)

                                                pCifsInode->clientCanCacheRead

                                                        = FALSE;

                                        pCifsInode->oplockPending = TRUE;

                                        AllocOplockQEntry(netfile->pInode,

                                                          netfile->netfid,

                                                          tcon);

                                        cFYI(1,

                                            ("about to wake up oplock thread"));

                                        if (oplockThread)

                                            wake_up_process(oplockThread);

                                        return TRUE;

                                }

                        }

                        read_unlock(&GlobalSMBSeslock);

                        cFYI(1, ("No matching file for oplock break"));

                        return TRUE;

                }

        }

        read_unlock(&GlobalSMBSeslock);

        cFYI(1, ("Can not process oplock break for non-existent connection"));

        return TRUE;

}

void

dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)

{

        int i, j;

        char debug_line[17];

        unsigned char *buffer;

        if (traceSMB == 0)

                return;

        buffer = (unsigned char *) smb_buf;

        for (i = 0, j = 0; i < smb_buf_length; i++, j++) {

                if (i % 8 == 0) {        /* have reached the beginning of line */

                        printk(KERN_DEBUG "| ");

                        j = 0;

                }

                printk("%0#4x ", buffer[i]);

                debug_line[2 * j] = ' ';

                if (isprint(buffer[i]))

                        debug_line[1 + (2 * j)] = buffer[i];

                else

                        debug_line[1 + (2 * j)] = '_';

                if (i % 8 == 7) { /* reached end of line, time to print ascii */

                        debug_line[16] = 0;

                        printk(" | %s\n", debug_line);

                }

        }

        for (; j < 8; j++) {

                printk("     ");

                debug_line[2 * j] = ' ';

                debug_line[1 + (2 * j)] = ' ';

        }

        printk( " | %s\n", debug_line);

        return;

}

/* Windows maps these to the user defined 16 bit Unicode range since they are

   reserved symbols (along with \ and /), otherwise illegal to store

   in filenames in NTFS */

#define UNI_ASTERIK     (__u16) ('*' + 0xF000)

#define UNI_QUESTION    (__u16) ('?' + 0xF000)

#define UNI_COLON       (__u16) (':' + 0xF000)

#define UNI_GRTRTHAN    (__u16) ('>' + 0xF000)

#define UNI_LESSTHAN    (__u16) ('<' + 0xF000)

#define UNI_PIPE        (__u16) ('|' + 0xF000)

#define UNI_SLASH       (__u16) ('\\' + 0xF000)

/* Convert 16 bit Unicode pathname from wire format to string in current code

   page.  Conversion may involve remapping up the seven characters that are

   only legal in POSIX-like OS (if they are present in the string). Path

   names are little endian 16 bit Unicode on the wire */

int

cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,

                    const struct nls_table *cp)

{

        int i, j, len;

        __u16 src_char;

        for (i = 0, j = 0; i < maxlen; i++) {

                src_char = le16_to_cpu(source[i]);