netmisc.c

Linux内核自带的cifs模块

	ERRHRD, ERRgeneral, NT_STATUS_CONNECTION_REFUSED}, {
	ERRHRD, ERRgeneral, NT_STATUS_GRACEFUL_DISCONNECT}, {
	ERRHRD, ERRgeneral, NT_STATUS_ADDRESS_ALREADY_ASSOCIATED}, {
	ERRHRD, ERRgeneral, NT_STATUS_ADDRESS_NOT_ASSOCIATED}, {
	ERRHRD, ERRgeneral, NT_STATUS_CONNECTION_INVALID}, {
	ERRHRD, ERRgeneral, NT_STATUS_CONNECTION_ACTIVE}, {
	ERRHRD, ERRgeneral, NT_STATUS_NETWORK_UNREACHABLE}, {
	ERRHRD, ERRgeneral, NT_STATUS_HOST_UNREACHABLE}, {
	ERRHRD, ERRgeneral, NT_STATUS_PROTOCOL_UNREACHABLE}, {
	ERRHRD, ERRgeneral, NT_STATUS_PORT_UNREACHABLE}, {
	ERRHRD, ERRgeneral, NT_STATUS_REQUEST_ABORTED}, {
	ERRHRD, ERRgeneral, NT_STATUS_CONNECTION_ABORTED}, {
	ERRHRD, ERRgeneral, NT_STATUS_BAD_COMPRESSION_BUFFER}, {
	ERRHRD, ERRgeneral, NT_STATUS_USER_MAPPED_FILE}, {
	ERRHRD, ERRgeneral, NT_STATUS_AUDIT_FAILED}, {
	ERRHRD, ERRgeneral, NT_STATUS_TIMER_RESOLUTION_NOT_SET}, {
	ERRHRD, ERRgeneral, NT_STATUS_CONNECTION_COUNT_LIMIT}, {
	ERRHRD, ERRgeneral, NT_STATUS_LOGIN_TIME_RESTRICTION}, {
	ERRHRD, ERRgeneral, NT_STATUS_LOGIN_WKSTA_RESTRICTION}, {
	ERRDOS, 193, NT_STATUS_IMAGE_MP_UP_MISMATCH}, {
	ERRHRD, ERRgeneral, 0xc000024a}, {
	ERRHRD, ERRgeneral, 0xc000024b}, {
	ERRHRD, ERRgeneral, 0xc000024c}, {
	ERRHRD, ERRgeneral, 0xc000024d}, {
	ERRHRD, ERRgeneral, 0xc000024e}, {
	ERRHRD, ERRgeneral, 0xc000024f}, {
	ERRHRD, ERRgeneral, NT_STATUS_INSUFFICIENT_LOGON_INFO}, {
	ERRHRD, ERRgeneral, NT_STATUS_BAD_DLL_ENTRYPOINT}, {
	ERRHRD, ERRgeneral, NT_STATUS_BAD_SERVICE_ENTRYPOINT}, {
	ERRHRD, ERRgeneral, NT_STATUS_LPC_REPLY_LOST}, {
	ERRHRD, ERRgeneral, NT_STATUS_IP_ADDRESS_CONFLICT1}, {
	ERRHRD, ERRgeneral, NT_STATUS_IP_ADDRESS_CONFLICT2}, {
	ERRHRD, ERRgeneral, NT_STATUS_REGISTRY_QUOTA_LIMIT}, {
	ERRSRV, 3, NT_STATUS_PATH_NOT_COVERED}, {
	ERRHRD, ERRgeneral, NT_STATUS_NO_CALLBACK_ACTIVE}, {
	ERRHRD, ERRgeneral, NT_STATUS_LICENSE_QUOTA_EXCEEDED}, {
	ERRHRD, ERRgeneral, NT_STATUS_PWD_TOO_SHORT}, {
	ERRHRD, ERRgeneral, NT_STATUS_PWD_TOO_RECENT}, {
	ERRHRD, ERRgeneral, NT_STATUS_PWD_HISTORY_CONFLICT}, {
	ERRHRD, ERRgeneral, 0xc000025d}, {
	ERRHRD, ERRgeneral, NT_STATUS_PLUGPLAY_NO_DEVICE}, {
	ERRHRD, ERRgeneral, NT_STATUS_UNSUPPORTED_COMPRESSION}, {
	ERRHRD, ERRgeneral, NT_STATUS_INVALID_HW_PROFILE}, {
	ERRHRD, ERRgeneral, NT_STATUS_INVALID_PLUGPLAY_DEVICE_PATH}, {
	ERRDOS, 182, NT_STATUS_DRIVER_ORDINAL_NOT_FOUND}, {
	ERRDOS, 127, NT_STATUS_DRIVER_ENTRYPOINT_NOT_FOUND}, {
	ERRDOS, 288, NT_STATUS_RESOURCE_NOT_OWNED}, {
	ERRDOS, ErrTooManyLinks, NT_STATUS_TOO_MANY_LINKS}, {
	ERRHRD, ERRgeneral, NT_STATUS_QUOTA_LIST_INCONSISTENT}, {
	ERRHRD, ERRgeneral, NT_STATUS_FILE_IS_OFFLINE}, {
	ERRDOS, 21, 0xc000026e}, {
	ERRDOS, 161, 0xc0000281}, {
	ERRDOS, ERRnoaccess, 0xc000028a}, {
	ERRDOS, ERRnoaccess, 0xc000028b}, {
	ERRHRD, ERRgeneral, 0xc000028c}, {
	ERRDOS, ERRnoaccess, 0xc000028d}, {
	ERRDOS, ERRnoaccess, 0xc000028e}, {
	ERRDOS, ERRnoaccess, 0xc000028f}, {
	ERRDOS, ERRnoaccess, 0xc0000290}, {
	ERRDOS, ERRbadfunc, 0xc000029c}, {
	ERRDOS, ERRinvlevel, 0x007c0001}, };

/*****************************************************************************
 Print an error message from the status code
 *****************************************************************************/
static void
cifs_print_status(__u32 status_code)
{
	int idx = 0;

	while (nt_errs[idx].nt_errstr != NULL) {
		if (((nt_errs[idx].nt_errcode) & 0xFFFFFF) ==
		    (status_code & 0xFFFFFF)) {
			printk(KERN_NOTICE "Status code returned 0x%08x %s\n",
				   status_code, nt_errs[idx].nt_errstr);
		}
		idx++;
	}
	return;
}


static void
ntstatus_to_dos(__u32 ntstatus, __u8 * eclass, __u16 * ecode)
{
	int i;
	if (ntstatus == 0) {
		*eclass = 0;
		*ecode = 0;
		return;
	}
	for (i = 0; ntstatus_to_dos_map[i].ntstatus; i++) {
		if (ntstatus == ntstatus_to_dos_map[i].ntstatus) {
			*eclass = ntstatus_to_dos_map[i].dos_class;
			*ecode = ntstatus_to_dos_map[i].dos_code;
			return;
		}
	}
	*eclass = ERRHRD;
	*ecode = ERRgeneral;
}

int
map_smb_to_linux_error(struct smb_hdr *smb)
{
	unsigned int i;
	int rc = -EIO;	/* if transport error smb error may not be set */
	__u8 smberrclass;
	__u16 smberrcode;

	/* BB if NT Status codes - map NT BB */

	/* old style smb error codes */
	if (smb->Status.CifsError == 0)
		return 0;

	if (smb->Flags2 & SMBFLG2_ERR_STATUS) {
		/* translate the newer STATUS codes to old style SMB errors
		 * and then to POSIX errors */
		__u32 err = le32_to_cpu(smb->Status.CifsError);
		if (cifsFYI & CIFS_RC)
			cifs_print_status(err);
		ntstatus_to_dos(err, &smberrclass, &smberrcode);
	} else {
		smberrclass = smb->Status.DosError.ErrorClass;
		smberrcode = le16_to_cpu(smb->Status.DosError.Error);
	}

	/* old style errors */

	/* DOS class smb error codes - map DOS */
	if (smberrclass == ERRDOS) {  /* 1 byte field no need to byte reverse */
		for (i = 0;
		     i <
		     sizeof (mapping_table_ERRDOS) /
		     sizeof (struct smb_to_posix_error); i++) {
			if (mapping_table_ERRDOS[i].smb_err == 0)
				break;
			else if (mapping_table_ERRDOS[i].smb_err ==
								smberrcode) {
				rc = mapping_table_ERRDOS[i].posix_code;
				break;
			}
			/* else try next error mapping one to see if match */
		}
	} else if (smberrclass == ERRSRV) {   /* server class of error codes */
		for (i = 0;
		     i <
		     sizeof (mapping_table_ERRSRV) /
		     sizeof (struct smb_to_posix_error); i++) {
			if (mapping_table_ERRSRV[i].smb_err == 0)
				break;
			else if (mapping_table_ERRSRV[i].smb_err ==
								smberrcode) {
				rc = mapping_table_ERRSRV[i].posix_code;
				break;
			}
			/* else try next error mapping to see if match */
		}
	}
	/* else ERRHRD class errors or junk  - return EIO */

	cFYI(1, (" !!Mapping smb error code %d to POSIX err %d !!",
		 smberrcode, rc));

	/* generic corrective action e.g. reconnect SMB session on
	 * ERRbaduid could be added */

	return rc;
}

/*
 * calculate the size of the SMB message based on the fixed header
 * portion, the number of word parameters and the data portion of the message
 */
unsigned int
smbCalcSize(struct smb_hdr *ptr)
{
	return (sizeof (struct smb_hdr) + (2 * ptr->WordCount) +
		2 /* size of the bcc field */ + BCC(ptr));
}

unsigned int
smbCalcSize_LE(struct smb_hdr *ptr)
{
	return (sizeof (struct smb_hdr) + (2 * ptr->WordCount) +
		2 /* size of the bcc field */ + le16_to_cpu(BCC_LE(ptr)));
}

/* The following are taken from fs/ntfs/util.c */

#define NTFS_TIME_OFFSET ((u64)(369*365 + 89) * 24 * 3600 * 10000000)

    /*
     * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
     * into Unix UTC (based 1970-01-01, in seconds).
     */

static int total_days_of_prev_months[] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};

__le64 cnvrtDosCifsTm(__u16 date, __u16 time)
{
	return cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(date, time)));
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)
struct timespec
cifs_NTtimeToUnix(u64 ntutc)
{
	struct timespec ts;
	/* BB what about the timezone? BB */

	/* Subtract the NTFS time offset, then convert to 1s intervals. */
	u64 t;

	t = ntutc - NTFS_TIME_OFFSET;
	ts.tv_nsec = do_div(t, 10000000) * 100;
	ts.tv_sec = t;
	return ts;
}

/* Convert the Unix UTC into NT UTC. */
u64
cifs_UnixTimeToNT(struct timespec t)
{
	/* Convert to 100ns intervals and then add the NTFS time offset. */
	return (u64) t.tv_sec * 10000000 + t.tv_nsec/100 + NTFS_TIME_OFFSET;
}


struct timespec cnvrtDosUnixTm(__u16 date, __u16 time)
{
	struct timespec ts;
	int sec, min, days, month, year;
	SMB_TIME * st = (SMB_TIME *)&time;
	SMB_DATE * sd = (SMB_DATE *)&date;

	cFYI(1, ("date %d time %d", date, time));

	sec = 2 * st->TwoSeconds;
	min = st->Minutes;
	if ((sec > 59) || (min > 59))
		cERROR(1, ("illegal time min %d sec %d", min, sec));
	sec += (min * 60);
	sec += 60 * 60 * st->Hours;
	if (st->Hours > 24)
		cERROR(1, ("illegal hours %d", st->Hours));
	days = sd->Day;
	month = sd->Month;
	if ((days > 31) || (month > 12))
		cERROR(1, ("illegal date, month %d day: %d", month, days));
	month -= 1;
	days += total_days_of_prev_months[month];
	days += 3652; /* account for difference in days between 1980 and 1970 */
	year = sd->Year;
	days += year * 365;
	days += (year/4); /* leap year */
	/* generalized leap year calculation is more complex, ie no leap year
	for years/100 except for years/400, but since the maximum number for DOS
	 year is 2**7, the last year is 1980+127, which means we need only
	 consider 2 special case years, ie the years 2000 and 2100, and only
	 adjust for the lack of leap year for the year 2100, as 2000 was a
	 leap year (divisable by 400) */
	if (year >= 120)  /* the year 2100 */
		days = days - 1;  /* do not count leap year for the year 2100 */

	/* adjust for leap year where we are still before leap day */
	if (year != 120)
		days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
	sec += 24 * 60 * 60 * days;

	ts.tv_sec = sec;

	/* cFYI(1,("sec after cnvrt dos to unix time %d",sec)); */

	ts.tv_nsec = 0;
	return ts;
}
#else
/* Did not merge changeset 268f3be177ce93791da38facc34126b5038cd851
 * and related time fixes into this function for 2.4 case
 */
time_t
cifs_NTtimeToUnix(__u64 ntutc)
{
	/* BB what about the timezone? BB */

	/* Subtract the NTFS time offset, then convert to 1s intervals.  */
	u64 t;

	t = ntutc - NTFS_TIME_OFFSET;
	do_div(t, 10000000);
	return (time_t)t;
}

/* Convert the Unix UTC into NT UTC. */
__u64
cifs_UnixTimeToNT(time_t t)
{
	__u64 dce_time;
   /* Convert to 100ns intervals and then add the NTFS time offset. */
	dce_time = (__u64) t * 10000000;
	dce_time += NTFS_TIME_OFFSET;
	return dce_time;
}
time_t cnvrtDosUnixTm(__u16 date, __u16 time)
{
	__u8  dt[2];
	__u8  tm[2];
	time_t ts;
	int sec,min, days, month, year;
/*    SMB_TIME * st = (SMB_TIME *)&time;*/

	cFYI(1,("date %d time %d",date, time));

	dt[0] = date & 0xFF;
	dt[1] = (date & 0xFF00) >> 8;
	tm[0] = time & 0xFF;
	tm[1] = (time & 0xFF00) >> 8;

	sec = tm[0] & 0x1F;
	sec = 2 * sec;
	min = ((tm[0] >>5)&0xFF) + ((tm[1] & 0x7)<<3);

	sec += (min * 60);
	sec += 60 * 60 * ((tm[1] >> 3) &0xFF) /* hours */;
	days = (dt[0] & 0x1F) - 1;
	month = ((dt[0] >> 5) & 0xFF) + ((dt[1] & 0x1) <<3);
	if(month > 12)
		cERROR(1,("illegal month %d in date", month));
	month -= 1;
	days += total_days_of_prev_months[month];
	days += 3653; /* account for difference in days between 1980 and 1970 */
	year = (dt[1]>>1) & 0xFF;
	days += year * 365;
	days += (year/4); /* leap year */
	/* generalized leap year calculation is more complex, ie no leap year
	for years/100 except for years/400, but since the maximum number for DOS
	 year is 2**7, the last year is 1980+127, which means we need only
	 consider 2 special case years, ie the years 2000 and 2100, and only
	 adjust for the lack of leap year for the year 2100, as 2000 was a 
	 leap year (divisable by 400) */
	if(year >= 120)  /* the year 2100 */
		days = days - 1;  /* do not count leap year for the year 2100 */

	/* adjust for leap year where we are still before leap day */
	days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
	sec += 24 * 60 * 60 * days;

	ts = (time_t)sec;

	return ts;
}
#endif