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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (c) International Business Machines Corp., 2002,2008
* Author(s): Steve French (sfrench@us.ibm.com)
*
* Error mapping routines from Samba libsmb/errormap.c
* Copyright (C) Andrew Tridgell 2001
*/
#include <linux/net.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/ctype.h>
#include <linux/fs.h>
#include <asm/div64.h>
#include <asm/byteorder.h>
#include <linux/inet.h>
#include "cifsfs.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "smb1proto.h"
#include "smberr.h"
#include "cifs_debug.h"
#include "nterr.h"
/*
* Convert a string containing text IPv4 or IPv6 address to binary form.
*
* Returns 0 on failure.
*/
static int
cifs_inet_pton(const int address_family, const char *cp, int len, void *dst)
{
int ret = 0;
/* calculate length by finding first slash or NULL */
if (address_family == AF_INET)
ret = in4_pton(cp, len, dst, '\\', NULL);
else if (address_family == AF_INET6)
ret = in6_pton(cp, len, dst , '\\', NULL);
cifs_dbg(NOISY, "address conversion returned %d for %*.*s\n",
ret, len, len, cp);
if (ret > 0)
ret = 1;
return ret;
}
/*
* Try to convert a string to an IPv4 address and then attempt to convert
* it to an IPv6 address if that fails. Set the family field if either
* succeeds. If it's an IPv6 address and it has a '%' sign in it, try to
* treat the part following it as a numeric sin6_scope_id.
*
* Returns 0 on failure.
*/
int
cifs_convert_address(struct sockaddr *dst, const char *src, int len)
{
int rc, alen, slen;
const char *pct;
char scope_id[13];
struct sockaddr_in *s4 = (struct sockaddr_in *) dst;
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) dst;
/* IPv4 address */
if (cifs_inet_pton(AF_INET, src, len, &s4->sin_addr.s_addr)) {
s4->sin_family = AF_INET;
return 1;
}
/* attempt to exclude the scope ID from the address part */
pct = memchr(src, '%', len);
alen = pct ? pct - src : len;
rc = cifs_inet_pton(AF_INET6, src, alen, &s6->sin6_addr.s6_addr);
if (!rc)
return rc;
s6->sin6_family = AF_INET6;
if (pct) {
/* grab the scope ID */
slen = len - (alen + 1);
if (slen <= 0 || slen > 12)
return 0;
memcpy(scope_id, pct + 1, slen);
scope_id[slen] = '\0';
rc = kstrtouint(scope_id, 0, &s6->sin6_scope_id);
rc = (rc == 0) ? 1 : 0;
}
return rc;
}
void
cifs_set_port(struct sockaddr *addr, const unsigned short int port)
{
switch (addr->sa_family) {
case AF_INET:
((struct sockaddr_in *)addr)->sin_port = htons(port);
break;
case AF_INET6:
((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
break;
}
}
/* 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).
*/
struct timespec64
cifs_NTtimeToUnix(__le64 ntutc)
{
struct timespec64 ts;
/* BB what about the timezone? BB */
/* Subtract the NTFS time offset, then convert to 1s intervals. */
s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
u64 abs_t;
/*
* Unfortunately can not use normal 64 bit division on 32 bit arch, but
* the alternative, do_div, does not work with negative numbers so have
* to special case them
*/
if (t < 0) {
abs_t = -t;
ts.tv_nsec = (time64_t)(do_div(abs_t, 10000000) * 100);
ts.tv_nsec = -ts.tv_nsec;
ts.tv_sec = -abs_t;
} else {
abs_t = t;
ts.tv_nsec = (time64_t)do_div(abs_t, 10000000) * 100;
ts.tv_sec = abs_t;
}
return ts;
}
/* Convert the Unix UTC into NT UTC. */
u64
cifs_UnixTimeToNT(struct timespec64 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;
}
static const int total_days_of_prev_months[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
struct timespec64 cnvrtDosUnixTm(__le16 le_date, __le16 le_time, int offset)
{
struct timespec64 ts;
time64_t sec, days;
int min, day, month, year;
u16 date = le16_to_cpu(le_date);
u16 time = le16_to_cpu(le_time);
SMB_TIME *st = (SMB_TIME *)&time;
SMB_DATE *sd = (SMB_DATE *)&date;
cifs_dbg(FYI, "date %d time %d\n", date, time);
sec = 2 * st->TwoSeconds;
min = st->Minutes;
if ((sec > 59) || (min > 59))
cifs_dbg(VFS, "Invalid time min %d sec %lld\n", min, sec);
sec += (min * 60);
sec += 60 * 60 * st->Hours;
if (st->Hours > 24)
cifs_dbg(VFS, "Invalid hours %d\n", st->Hours);
day = sd->Day;
month = sd->Month;
if (day < 1 || day > 31 || month < 1 || month > 12) {
cifs_dbg(VFS, "Invalid date, month %d day: %d\n", month, day);
day = clamp(day, 1, 31);
month = clamp(month, 1, 12);
}
month -= 1;
days = day + 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 (divisible 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 + offset;
/* cifs_dbg(FYI, "sec after cnvrt dos to unix time %d\n",sec); */
ts.tv_nsec = 0;
return ts;
}
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